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-rw-r--r--crates/ide/src/diagnostics.rs958
-rw-r--r--crates/ide/src/diagnostics/missing_match_arms.rs929
2 files changed, 944 insertions, 943 deletions
diff --git a/crates/ide/src/diagnostics.rs b/crates/ide/src/diagnostics.rs
index 7978c1fc2..c024e3e1e 100644
--- a/crates/ide/src/diagnostics.rs
+++ b/crates/ide/src/diagnostics.rs
@@ -10,6 +10,7 @@ mod incorrect_case;
10mod macro_error; 10mod macro_error;
11mod mismatched_arg_count; 11mod mismatched_arg_count;
12mod missing_fields; 12mod missing_fields;
13mod missing_match_arms;
13mod missing_ok_or_some_in_tail_expr; 14mod missing_ok_or_some_in_tail_expr;
14mod missing_unsafe; 15mod missing_unsafe;
15mod no_such_field; 16mod no_such_field;
@@ -25,12 +26,7 @@ mod unresolved_proc_macro;
25 26
26mod field_shorthand; 27mod field_shorthand;
27 28
28use std::cell::RefCell; 29use hir::{diagnostics::AnyDiagnostic, Semantics};
29
30use hir::{
31 diagnostics::{AnyDiagnostic, DiagnosticCode, DiagnosticSinkBuilder},
32 Semantics,
33};
34use ide_assists::AssistResolveStrategy; 30use ide_assists::AssistResolveStrategy;
35use ide_db::{base_db::SourceDatabase, RootDatabase}; 31use ide_db::{base_db::SourceDatabase, RootDatabase};
36use itertools::Itertools; 32use itertools::Itertools;
@@ -44,6 +40,15 @@ use unlinked_file::UnlinkedFile;
44 40
45use crate::{Assist, AssistId, AssistKind, FileId, Label, SourceChange}; 41use crate::{Assist, AssistId, AssistKind, FileId, Label, SourceChange};
46 42
43#[derive(Copy, Clone, Debug, PartialEq)]
44pub struct DiagnosticCode(pub &'static str);
45
46impl DiagnosticCode {
47 pub fn as_str(&self) -> &str {
48 self.0
49 }
50}
51
47#[derive(Debug)] 52#[derive(Debug)]
48pub struct Diagnostic { 53pub struct Diagnostic {
49 // pub name: Option<String>, 54 // pub name: Option<String>,
@@ -112,10 +117,6 @@ impl Diagnostic {
112 fn with_unused(self, unused: bool) -> Self { 117 fn with_unused(self, unused: bool) -> Self {
113 Self { unused, ..self } 118 Self { unused, ..self }
114 } 119 }
115
116 fn with_code(self, code: Option<DiagnosticCode>) -> Self {
117 Self { code, ..self }
118 }
119} 120}
120 121
121#[derive(Debug, Copy, Clone)] 122#[derive(Debug, Copy, Clone)]
@@ -160,36 +161,13 @@ pub(crate) fn diagnostics(
160 check_unnecessary_braces_in_use_statement(&mut res, file_id, &node); 161 check_unnecessary_braces_in_use_statement(&mut res, file_id, &node);
161 field_shorthand::check(&mut res, file_id, &node); 162 field_shorthand::check(&mut res, file_id, &node);
162 } 163 }
163 let res = RefCell::new(res);
164 let sink_builder = DiagnosticSinkBuilder::new()
165 // Only collect experimental diagnostics when they're enabled.
166 .filter(|diag| !(diag.is_experimental() && config.disable_experimental))
167 .filter(|diag| !config.disabled.contains(diag.code().as_str()));
168
169 // Finalize the `DiagnosticSink` building process.
170 let mut sink = sink_builder
171 // Diagnostics not handled above get no fix and default treatment.
172 .build(|d| {
173 res.borrow_mut().push(
174 Diagnostic::error(
175 sema.diagnostics_display_range(d.display_source()).range,
176 d.message(),
177 )
178 .with_code(Some(d.code())),
179 );
180 });
181 164
182 let mut diags = Vec::new(); 165 let mut diags = Vec::new();
183 let internal_diagnostics = cfg!(test);
184 let module = sema.to_module_def(file_id); 166 let module = sema.to_module_def(file_id);
185 if let Some(m) = module { 167 if let Some(m) = module {
186 diags = m.diagnostics(db, &mut sink, internal_diagnostics) 168 m.diagnostics(db, &mut diags)
187 } 169 }
188 170
189 drop(sink);
190
191 let mut res = res.into_inner();
192
193 let ctx = DiagnosticsContext { config, sema, resolve }; 171 let ctx = DiagnosticsContext { config, sema, resolve };
194 if module.is_none() { 172 if module.is_none() {
195 let d = UnlinkedFile { file: file_id }; 173 let d = UnlinkedFile { file: file_id };
@@ -205,6 +183,7 @@ pub(crate) fn diagnostics(
205 AnyDiagnostic::MacroError(d) => macro_error::macro_error(&ctx, &d), 183 AnyDiagnostic::MacroError(d) => macro_error::macro_error(&ctx, &d),
206 AnyDiagnostic::MismatchedArgCount(d) => mismatched_arg_count::mismatched_arg_count(&ctx, &d), 184 AnyDiagnostic::MismatchedArgCount(d) => mismatched_arg_count::mismatched_arg_count(&ctx, &d),
207 AnyDiagnostic::MissingFields(d) => missing_fields::missing_fields(&ctx, &d), 185 AnyDiagnostic::MissingFields(d) => missing_fields::missing_fields(&ctx, &d),
186 AnyDiagnostic::MissingMatchArms(d) => missing_match_arms::missing_match_arms(&ctx, &d),
208 AnyDiagnostic::MissingOkOrSomeInTailExpr(d) => missing_ok_or_some_in_tail_expr::missing_ok_or_some_in_tail_expr(&ctx, &d), 187 AnyDiagnostic::MissingOkOrSomeInTailExpr(d) => missing_ok_or_some_in_tail_expr::missing_ok_or_some_in_tail_expr(&ctx, &d),
209 AnyDiagnostic::MissingUnsafe(d) => missing_unsafe::missing_unsafe(&ctx, &d), 188 AnyDiagnostic::MissingUnsafe(d) => missing_unsafe::missing_unsafe(&ctx, &d),
210 AnyDiagnostic::NoSuchField(d) => no_such_field::no_such_field(&ctx, &d), 189 AnyDiagnostic::NoSuchField(d) => no_such_field::no_such_field(&ctx, &d),
@@ -349,8 +328,8 @@ mod tests {
349 ) 328 )
350 .unwrap() 329 .unwrap()
351 .pop() 330 .pop()
352 .unwrap(); 331 .expect("no diagnostics");
353 let fix = &diagnostic.fixes.unwrap()[nth]; 332 let fix = &diagnostic.fixes.expect("diagnostic misses fixes")[nth];
354 let actual = { 333 let actual = {
355 let source_change = fix.source_change.as_ref().unwrap(); 334 let source_change = fix.source_change.as_ref().unwrap();
356 let file_id = *source_change.source_file_edits.keys().next().unwrap(); 335 let file_id = *source_change.source_file_edits.keys().next().unwrap();
@@ -545,910 +524,3 @@ pub struct Claims {
545 ); 524 );
546 } 525 }
547} 526}
548
549#[cfg(test)]
550pub(super) mod match_check_tests {
551 use crate::diagnostics::tests::check_diagnostics;
552
553 #[test]
554 fn empty_tuple() {
555 check_diagnostics(
556 r#"
557fn main() {
558 match () { }
559 //^^ Missing match arm
560 match (()) { }
561 //^^^^ Missing match arm
562
563 match () { _ => (), }
564 match () { () => (), }
565 match (()) { (()) => (), }
566}
567"#,
568 );
569 }
570
571 #[test]
572 fn tuple_of_two_empty_tuple() {
573 check_diagnostics(
574 r#"
575fn main() {
576 match ((), ()) { }
577 //^^^^^^^^ Missing match arm
578
579 match ((), ()) { ((), ()) => (), }
580}
581"#,
582 );
583 }
584
585 #[test]
586 fn boolean() {
587 check_diagnostics(
588 r#"
589fn test_main() {
590 match false { }
591 //^^^^^ Missing match arm
592 match false { true => (), }
593 //^^^^^ Missing match arm
594 match (false, true) {}
595 //^^^^^^^^^^^^^ Missing match arm
596 match (false, true) { (true, true) => (), }
597 //^^^^^^^^^^^^^ Missing match arm
598 match (false, true) {
599 //^^^^^^^^^^^^^ Missing match arm
600 (false, true) => (),
601 (false, false) => (),
602 (true, false) => (),
603 }
604 match (false, true) { (true, _x) => (), }
605 //^^^^^^^^^^^^^ Missing match arm
606
607 match false { true => (), false => (), }
608 match (false, true) {
609 (false, _) => (),
610 (true, false) => (),
611 (_, true) => (),
612 }
613 match (false, true) {
614 (true, true) => (),
615 (true, false) => (),
616 (false, true) => (),
617 (false, false) => (),
618 }
619 match (false, true) {
620 (true, _x) => (),
621 (false, true) => (),
622 (false, false) => (),
623 }
624 match (false, true, false) {
625 (false, ..) => (),
626 (true, ..) => (),
627 }
628 match (false, true, false) {
629 (.., false) => (),
630 (.., true) => (),
631 }
632 match (false, true, false) { (..) => (), }
633}
634"#,
635 );
636 }
637
638 #[test]
639 fn tuple_of_tuple_and_bools() {
640 check_diagnostics(
641 r#"
642fn main() {
643 match (false, ((), false)) {}
644 //^^^^^^^^^^^^^^^^^^^^ Missing match arm
645 match (false, ((), false)) { (true, ((), true)) => (), }
646 //^^^^^^^^^^^^^^^^^^^^ Missing match arm
647 match (false, ((), false)) { (true, _) => (), }
648 //^^^^^^^^^^^^^^^^^^^^ Missing match arm
649
650 match (false, ((), false)) {
651 (true, ((), true)) => (),
652 (true, ((), false)) => (),
653 (false, ((), true)) => (),
654 (false, ((), false)) => (),
655 }
656 match (false, ((), false)) {
657 (true, ((), true)) => (),
658 (true, ((), false)) => (),
659 (false, _) => (),
660 }
661}
662"#,
663 );
664 }
665
666 #[test]
667 fn enums() {
668 check_diagnostics(
669 r#"
670enum Either { A, B, }
671
672fn main() {
673 match Either::A { }
674 //^^^^^^^^^ Missing match arm
675 match Either::B { Either::A => (), }
676 //^^^^^^^^^ Missing match arm
677
678 match &Either::B {
679 //^^^^^^^^^^ Missing match arm
680 Either::A => (),
681 }
682
683 match Either::B {
684 Either::A => (), Either::B => (),
685 }
686 match &Either::B {
687 Either::A => (), Either::B => (),
688 }
689}
690"#,
691 );
692 }
693
694 #[test]
695 fn enum_containing_bool() {
696 check_diagnostics(
697 r#"
698enum Either { A(bool), B }
699
700fn main() {
701 match Either::B { }
702 //^^^^^^^^^ Missing match arm
703 match Either::B {
704 //^^^^^^^^^ Missing match arm
705 Either::A(true) => (), Either::B => ()
706 }
707
708 match Either::B {
709 Either::A(true) => (),
710 Either::A(false) => (),
711 Either::B => (),
712 }
713 match Either::B {
714 Either::B => (),
715 _ => (),
716 }
717 match Either::B {
718 Either::A(_) => (),
719 Either::B => (),
720 }
721
722}
723 "#,
724 );
725 }
726
727 #[test]
728 fn enum_different_sizes() {
729 check_diagnostics(
730 r#"
731enum Either { A(bool), B(bool, bool) }
732
733fn main() {
734 match Either::A(false) {
735 //^^^^^^^^^^^^^^^^ Missing match arm
736 Either::A(_) => (),
737 Either::B(false, _) => (),
738 }
739
740 match Either::A(false) {
741 Either::A(_) => (),
742 Either::B(true, _) => (),
743 Either::B(false, _) => (),
744 }
745 match Either::A(false) {
746 Either::A(true) | Either::A(false) => (),
747 Either::B(true, _) => (),
748 Either::B(false, _) => (),
749 }
750}
751"#,
752 );
753 }
754
755 #[test]
756 fn tuple_of_enum_no_diagnostic() {
757 check_diagnostics(
758 r#"
759enum Either { A(bool), B(bool, bool) }
760enum Either2 { C, D }
761
762fn main() {
763 match (Either::A(false), Either2::C) {
764 (Either::A(true), _) | (Either::A(false), _) => (),
765 (Either::B(true, _), Either2::C) => (),
766 (Either::B(false, _), Either2::C) => (),
767 (Either::B(_, _), Either2::D) => (),
768 }
769}
770"#,
771 );
772 }
773
774 #[test]
775 fn or_pattern_no_diagnostic() {
776 check_diagnostics(
777 r#"
778enum Either {A, B}
779
780fn main() {
781 match (Either::A, Either::B) {
782 (Either::A | Either::B, _) => (),
783 }
784}"#,
785 )
786 }
787
788 #[test]
789 fn mismatched_types() {
790 // Match statements with arms that don't match the
791 // expression pattern do not fire this diagnostic.
792 check_diagnostics(
793 r#"
794enum Either { A, B }
795enum Either2 { C, D }
796
797fn main() {
798 match Either::A {
799 Either2::C => (),
800 // ^^^^^^^^^^ Internal: match check bailed out
801 Either2::D => (),
802 }
803 match (true, false) {
804 (true, false, true) => (),
805 // ^^^^^^^^^^^^^^^^^^^ Internal: match check bailed out
806 (true) => (),
807 }
808 match (true, false) { (true,) => {} }
809 // ^^^^^^^ Internal: match check bailed out
810 match (0) { () => () }
811 // ^^ Internal: match check bailed out
812 match Unresolved::Bar { Unresolved::Baz => () }
813}
814 "#,
815 );
816 }
817
818 #[test]
819 fn mismatched_types_in_or_patterns() {
820 check_diagnostics(
821 r#"
822fn main() {
823 match false { true | () => {} }
824 // ^^^^^^^^^ Internal: match check bailed out
825 match (false,) { (true | (),) => {} }
826 // ^^^^^^^^^^^^ Internal: match check bailed out
827}
828"#,
829 );
830 }
831
832 #[test]
833 fn malformed_match_arm_tuple_enum_missing_pattern() {
834 // We are testing to be sure we don't panic here when the match
835 // arm `Either::B` is missing its pattern.
836 check_diagnostics(
837 r#"
838enum Either { A, B(u32) }
839
840fn main() {
841 match Either::A {
842 Either::A => (),
843 Either::B() => (),
844 }
845}
846"#,
847 );
848 }
849
850 #[test]
851 fn malformed_match_arm_extra_fields() {
852 check_diagnostics(
853 r#"
854enum A { B(isize, isize), C }
855fn main() {
856 match A::B(1, 2) {
857 A::B(_, _, _) => (),
858 // ^^^^^^^^^^^^^ Internal: match check bailed out
859 }
860 match A::B(1, 2) {
861 A::C(_) => (),
862 // ^^^^^^^ Internal: match check bailed out
863 }
864}
865"#,
866 );
867 }
868
869 #[test]
870 fn expr_diverges() {
871 check_diagnostics(
872 r#"
873enum Either { A, B }
874
875fn main() {
876 match loop {} {
877 Either::A => (),
878 // ^^^^^^^^^ Internal: match check bailed out
879 Either::B => (),
880 }
881 match loop {} {
882 Either::A => (),
883 // ^^^^^^^^^ Internal: match check bailed out
884 }
885 match loop { break Foo::A } {
886 //^^^^^^^^^^^^^^^^^^^^^ Missing match arm
887 Either::A => (),
888 }
889 match loop { break Foo::A } {
890 Either::A => (),
891 Either::B => (),
892 }
893}
894"#,
895 );
896 }
897
898 #[test]
899 fn expr_partially_diverges() {
900 check_diagnostics(
901 r#"
902enum Either<T> { A(T), B }
903
904fn foo() -> Either<!> { Either::B }
905fn main() -> u32 {
906 match foo() {
907 Either::A(val) => val,
908 Either::B => 0,
909 }
910}
911"#,
912 );
913 }
914
915 #[test]
916 fn enum_record() {
917 check_diagnostics(
918 r#"
919enum Either { A { foo: bool }, B }
920
921fn main() {
922 let a = Either::A { foo: true };
923 match a { }
924 //^ Missing match arm
925 match a { Either::A { foo: true } => () }
926 //^ Missing match arm
927 match a {
928 Either::A { } => (),
929 //^^^^^^^^^ Missing structure fields:
930 // | - foo
931 Either::B => (),
932 }
933 match a {
934 //^ Missing match arm
935 Either::A { } => (),
936 } //^^^^^^^^^ Missing structure fields:
937 // | - foo
938
939 match a {
940 Either::A { foo: true } => (),
941 Either::A { foo: false } => (),
942 Either::B => (),
943 }
944 match a {
945 Either::A { foo: _ } => (),
946 Either::B => (),
947 }
948}
949"#,
950 );
951 }
952
953 #[test]
954 fn enum_record_fields_out_of_order() {
955 check_diagnostics(
956 r#"
957enum Either {
958 A { foo: bool, bar: () },
959 B,
960}
961
962fn main() {
963 let a = Either::A { foo: true, bar: () };
964 match a {
965 //^ Missing match arm
966 Either::A { bar: (), foo: false } => (),
967 Either::A { foo: true, bar: () } => (),
968 }
969
970 match a {
971 Either::A { bar: (), foo: false } => (),
972 Either::A { foo: true, bar: () } => (),
973 Either::B => (),
974 }
975}
976"#,
977 );
978 }
979
980 #[test]
981 fn enum_record_ellipsis() {
982 check_diagnostics(
983 r#"
984enum Either {
985 A { foo: bool, bar: bool },
986 B,
987}
988
989fn main() {
990 let a = Either::B;
991 match a {
992 //^ Missing match arm
993 Either::A { foo: true, .. } => (),
994 Either::B => (),
995 }
996 match a {
997 //^ Missing match arm
998 Either::A { .. } => (),
999 }
1000
1001 match a {
1002 Either::A { foo: true, .. } => (),
1003 Either::A { foo: false, .. } => (),
1004 Either::B => (),
1005 }
1006
1007 match a {
1008 Either::A { .. } => (),
1009 Either::B => (),
1010 }
1011}
1012"#,
1013 );
1014 }
1015
1016 #[test]
1017 fn enum_tuple_partial_ellipsis() {
1018 check_diagnostics(
1019 r#"
1020enum Either {
1021 A(bool, bool, bool, bool),
1022 B,
1023}
1024
1025fn main() {
1026 match Either::B {
1027 //^^^^^^^^^ Missing match arm
1028 Either::A(true, .., true) => (),
1029 Either::A(true, .., false) => (),
1030 Either::A(false, .., false) => (),
1031 Either::B => (),
1032 }
1033 match Either::B {
1034 //^^^^^^^^^ Missing match arm
1035 Either::A(true, .., true) => (),
1036 Either::A(true, .., false) => (),
1037 Either::A(.., true) => (),
1038 Either::B => (),
1039 }
1040
1041 match Either::B {
1042 Either::A(true, .., true) => (),
1043 Either::A(true, .., false) => (),
1044 Either::A(false, .., true) => (),
1045 Either::A(false, .., false) => (),
1046 Either::B => (),
1047 }
1048 match Either::B {
1049 Either::A(true, .., true) => (),
1050 Either::A(true, .., false) => (),
1051 Either::A(.., true) => (),
1052 Either::A(.., false) => (),
1053 Either::B => (),
1054 }
1055}
1056"#,
1057 );
1058 }
1059
1060 #[test]
1061 fn never() {
1062 check_diagnostics(
1063 r#"
1064enum Never {}
1065
1066fn enum_(never: Never) {
1067 match never {}
1068}
1069fn enum_ref(never: &Never) {
1070 match never {}
1071 //^^^^^ Missing match arm
1072}
1073fn bang(never: !) {
1074 match never {}
1075}
1076"#,
1077 );
1078 }
1079
1080 #[test]
1081 fn unknown_type() {
1082 check_diagnostics(
1083 r#"
1084enum Option<T> { Some(T), None }
1085
1086fn main() {
1087 // `Never` is deliberately not defined so that it's an uninferred type.
1088 match Option::<Never>::None {
1089 None => (),
1090 Some(never) => match never {},
1091 // ^^^^^^^^^^^ Internal: match check bailed out
1092 }
1093 match Option::<Never>::None {
1094 //^^^^^^^^^^^^^^^^^^^^^ Missing match arm
1095 Option::Some(_never) => {},
1096 }
1097}
1098"#,
1099 );
1100 }
1101
1102 #[test]
1103 fn tuple_of_bools_with_ellipsis_at_end_missing_arm() {
1104 check_diagnostics(
1105 r#"
1106fn main() {
1107 match (false, true, false) {
1108 //^^^^^^^^^^^^^^^^^^^^ Missing match arm
1109 (false, ..) => (),
1110 }
1111}"#,
1112 );
1113 }
1114
1115 #[test]
1116 fn tuple_of_bools_with_ellipsis_at_beginning_missing_arm() {
1117 check_diagnostics(
1118 r#"
1119fn main() {
1120 match (false, true, false) {
1121 //^^^^^^^^^^^^^^^^^^^^ Missing match arm
1122 (.., false) => (),
1123 }
1124}"#,
1125 );
1126 }
1127
1128 #[test]
1129 fn tuple_of_bools_with_ellipsis_in_middle_missing_arm() {
1130 check_diagnostics(
1131 r#"
1132fn main() {
1133 match (false, true, false) {
1134 //^^^^^^^^^^^^^^^^^^^^ Missing match arm
1135 (true, .., false) => (),
1136 }
1137}"#,
1138 );
1139 }
1140
1141 #[test]
1142 fn record_struct() {
1143 check_diagnostics(
1144 r#"struct Foo { a: bool }
1145fn main(f: Foo) {
1146 match f {}
1147 //^ Missing match arm
1148 match f { Foo { a: true } => () }
1149 //^ Missing match arm
1150 match &f { Foo { a: true } => () }
1151 //^^ Missing match arm
1152 match f { Foo { a: _ } => () }
1153 match f {
1154 Foo { a: true } => (),
1155 Foo { a: false } => (),
1156 }
1157 match &f {
1158 Foo { a: true } => (),
1159 Foo { a: false } => (),
1160 }
1161}
1162"#,
1163 );
1164 }
1165
1166 #[test]
1167 fn tuple_struct() {
1168 check_diagnostics(
1169 r#"struct Foo(bool);
1170fn main(f: Foo) {
1171 match f {}
1172 //^ Missing match arm
1173 match f { Foo(true) => () }
1174 //^ Missing match arm
1175 match f {
1176 Foo(true) => (),
1177 Foo(false) => (),
1178 }
1179}
1180"#,
1181 );
1182 }
1183
1184 #[test]
1185 fn unit_struct() {
1186 check_diagnostics(
1187 r#"struct Foo;
1188fn main(f: Foo) {
1189 match f {}
1190 //^ Missing match arm
1191 match f { Foo => () }
1192}
1193"#,
1194 );
1195 }
1196
1197 #[test]
1198 fn record_struct_ellipsis() {
1199 check_diagnostics(
1200 r#"struct Foo { foo: bool, bar: bool }
1201fn main(f: Foo) {
1202 match f { Foo { foo: true, .. } => () }
1203 //^ Missing match arm
1204 match f {
1205 //^ Missing match arm
1206 Foo { foo: true, .. } => (),
1207 Foo { bar: false, .. } => ()
1208 }
1209 match f { Foo { .. } => () }
1210 match f {
1211 Foo { foo: true, .. } => (),
1212 Foo { foo: false, .. } => ()
1213 }
1214}
1215"#,
1216 );
1217 }
1218
1219 #[test]
1220 fn internal_or() {
1221 check_diagnostics(
1222 r#"
1223fn main() {
1224 enum Either { A(bool), B }
1225 match Either::B {
1226 //^^^^^^^^^ Missing match arm
1227 Either::A(true | false) => (),
1228 }
1229}
1230"#,
1231 );
1232 }
1233
1234 #[test]
1235 fn no_panic_at_unimplemented_subpattern_type() {
1236 check_diagnostics(
1237 r#"
1238struct S { a: char}
1239fn main(v: S) {
1240 match v { S{ a } => {} }
1241 match v { S{ a: _x } => {} }
1242 match v { S{ a: 'a' } => {} }
1243 //^^^^^^^^^^^ Internal: match check bailed out
1244 match v { S{..} => {} }
1245 match v { _ => {} }
1246 match v { }
1247 //^ Missing match arm
1248}
1249"#,
1250 );
1251 }
1252
1253 #[test]
1254 fn binding() {
1255 check_diagnostics(
1256 r#"
1257fn main() {
1258 match true {
1259 _x @ true => {}
1260 false => {}
1261 }
1262 match true { _x @ true => {} }
1263 //^^^^ Missing match arm
1264}
1265"#,
1266 );
1267 }
1268
1269 #[test]
1270 fn binding_ref_has_correct_type() {
1271 // Asserts `PatKind::Binding(ref _x): bool`, not &bool.
1272 // If that's not true match checking will panic with "incompatible constructors"
1273 // FIXME: make facilities to test this directly like `tests::check_infer(..)`
1274 check_diagnostics(
1275 r#"
1276enum Foo { A }
1277fn main() {
1278 // FIXME: this should not bail out but current behavior is such as the old algorithm.
1279 // ExprValidator::validate_match(..) checks types of top level patterns incorrecly.
1280 match Foo::A {
1281 ref _x => {}
1282 // ^^^^^^ Internal: match check bailed out
1283 Foo::A => {}
1284 }
1285 match (true,) {
1286 (ref _x,) => {}
1287 (true,) => {}
1288 }
1289}
1290"#,
1291 );
1292 }
1293
1294 #[test]
1295 fn enum_non_exhaustive() {
1296 check_diagnostics(
1297 r#"
1298//- /lib.rs crate:lib
1299#[non_exhaustive]
1300pub enum E { A, B }
1301fn _local() {
1302 match E::A { _ => {} }
1303 match E::A {
1304 E::A => {}
1305 E::B => {}
1306 }
1307 match E::A {
1308 E::A | E::B => {}
1309 }
1310}
1311
1312//- /main.rs crate:main deps:lib
1313use lib::E;
1314fn main() {
1315 match E::A { _ => {} }
1316 match E::A {
1317 //^^^^ Missing match arm
1318 E::A => {}
1319 E::B => {}
1320 }
1321 match E::A {
1322 //^^^^ Missing match arm
1323 E::A | E::B => {}
1324 }
1325}
1326"#,
1327 );
1328 }
1329
1330 #[test]
1331 fn match_guard() {
1332 check_diagnostics(
1333 r#"
1334fn main() {
1335 match true {
1336 true if false => {}
1337 true => {}
1338 false => {}
1339 }
1340 match true {
1341 //^^^^ Missing match arm
1342 true if false => {}
1343 false => {}
1344 }
1345}
1346"#,
1347 );
1348 }
1349
1350 #[test]
1351 fn pattern_type_is_of_substitution() {
1352 cov_mark::check!(match_check_wildcard_expanded_to_substitutions);
1353 check_diagnostics(
1354 r#"
1355struct Foo<T>(T);
1356struct Bar;
1357fn main() {
1358 match Foo(Bar) {
1359 _ | Foo(Bar) => {}
1360 }
1361}
1362"#,
1363 );
1364 }
1365
1366 #[test]
1367 fn record_struct_no_such_field() {
1368 check_diagnostics(
1369 r#"
1370struct Foo { }
1371fn main(f: Foo) {
1372 match f { Foo { bar } => () }
1373 // ^^^^^^^^^^^ Internal: match check bailed out
1374}
1375"#,
1376 );
1377 }
1378
1379 #[test]
1380 fn match_ergonomics_issue_9095() {
1381 check_diagnostics(
1382 r#"
1383enum Foo<T> { A(T) }
1384fn main() {
1385 match &Foo::A(true) {
1386 _ => {}
1387 Foo::A(_) => {}
1388 }
1389}
1390"#,
1391 );
1392 }
1393
1394 mod false_negatives {
1395 //! The implementation of match checking here is a work in progress. As we roll this out, we
1396 //! prefer false negatives to false positives (ideally there would be no false positives). This
1397 //! test module should document known false negatives. Eventually we will have a complete
1398 //! implementation of match checking and this module will be empty.
1399 //!
1400 //! The reasons for documenting known false negatives:
1401 //!
1402 //! 1. It acts as a backlog of work that can be done to improve the behavior of the system.
1403 //! 2. It ensures the code doesn't panic when handling these cases.
1404 use super::*;
1405
1406 #[test]
1407 fn integers() {
1408 // We don't currently check integer exhaustiveness.
1409 check_diagnostics(
1410 r#"
1411fn main() {
1412 match 5 {
1413 10 => (),
1414 // ^^ Internal: match check bailed out
1415 11..20 => (),
1416 }
1417}
1418"#,
1419 );
1420 }
1421
1422 #[test]
1423 fn reference_patterns_at_top_level() {
1424 check_diagnostics(
1425 r#"
1426fn main() {
1427 match &false {
1428 &true => {}
1429 // ^^^^^ Internal: match check bailed out
1430 }
1431}
1432 "#,
1433 );
1434 }
1435
1436 #[test]
1437 fn reference_patterns_in_fields() {
1438 check_diagnostics(
1439 r#"
1440fn main() {
1441 match (&false,) {
1442 (true,) => {}
1443 // ^^^^^^^ Internal: match check bailed out
1444 }
1445 match (&false,) {
1446 (&true,) => {}
1447 // ^^^^^^^^ Internal: match check bailed out
1448 }
1449}
1450 "#,
1451 );
1452 }
1453 }
1454}
diff --git a/crates/ide/src/diagnostics/missing_match_arms.rs b/crates/ide/src/diagnostics/missing_match_arms.rs
new file mode 100644
index 000000000..b636489b3
--- /dev/null
+++ b/crates/ide/src/diagnostics/missing_match_arms.rs
@@ -0,0 +1,929 @@
1use hir::InFile;
2
3use crate::diagnostics::{Diagnostic, DiagnosticsContext};
4
5// Diagnostic: missing-match-arm
6//
7// This diagnostic is triggered if `match` block is missing one or more match arms.
8pub(super) fn missing_match_arms(
9 ctx: &DiagnosticsContext<'_>,
10 d: &hir::MissingMatchArms,
11) -> Diagnostic {
12 Diagnostic::new(
13 "missing-match-arm",
14 "missing match arm",
15 ctx.sema.diagnostics_display_range(InFile::new(d.file, d.match_expr.clone().into())).range,
16 )
17}
18
19#[cfg(test)]
20pub(super) mod tests {
21 use crate::diagnostics::tests::check_diagnostics;
22
23 fn check_diagnostics_no_bails(ra_fixture: &str) {
24 cov_mark::check_count!(validate_match_bailed_out, 0);
25 crate::diagnostics::tests::check_diagnostics(ra_fixture)
26 }
27
28 #[test]
29 fn empty_tuple() {
30 check_diagnostics_no_bails(
31 r#"
32fn main() {
33 match () { }
34 //^^ missing match arm
35 match (()) { }
36 //^^^^ missing match arm
37
38 match () { _ => (), }
39 match () { () => (), }
40 match (()) { (()) => (), }
41}
42"#,
43 );
44 }
45
46 #[test]
47 fn tuple_of_two_empty_tuple() {
48 check_diagnostics_no_bails(
49 r#"
50fn main() {
51 match ((), ()) { }
52 //^^^^^^^^ missing match arm
53
54 match ((), ()) { ((), ()) => (), }
55}
56"#,
57 );
58 }
59
60 #[test]
61 fn boolean() {
62 check_diagnostics_no_bails(
63 r#"
64fn test_main() {
65 match false { }
66 //^^^^^ missing match arm
67 match false { true => (), }
68 //^^^^^ missing match arm
69 match (false, true) {}
70 //^^^^^^^^^^^^^ missing match arm
71 match (false, true) { (true, true) => (), }
72 //^^^^^^^^^^^^^ missing match arm
73 match (false, true) {
74 //^^^^^^^^^^^^^ missing match arm
75 (false, true) => (),
76 (false, false) => (),
77 (true, false) => (),
78 }
79 match (false, true) { (true, _x) => (), }
80 //^^^^^^^^^^^^^ missing match arm
81
82 match false { true => (), false => (), }
83 match (false, true) {
84 (false, _) => (),
85 (true, false) => (),
86 (_, true) => (),
87 }
88 match (false, true) {
89 (true, true) => (),
90 (true, false) => (),
91 (false, true) => (),
92 (false, false) => (),
93 }
94 match (false, true) {
95 (true, _x) => (),
96 (false, true) => (),
97 (false, false) => (),
98 }
99 match (false, true, false) {
100 (false, ..) => (),
101 (true, ..) => (),
102 }
103 match (false, true, false) {
104 (.., false) => (),
105 (.., true) => (),
106 }
107 match (false, true, false) { (..) => (), }
108}
109"#,
110 );
111 }
112
113 #[test]
114 fn tuple_of_tuple_and_bools() {
115 check_diagnostics_no_bails(
116 r#"
117fn main() {
118 match (false, ((), false)) {}
119 //^^^^^^^^^^^^^^^^^^^^ missing match arm
120 match (false, ((), false)) { (true, ((), true)) => (), }
121 //^^^^^^^^^^^^^^^^^^^^ missing match arm
122 match (false, ((), false)) { (true, _) => (), }
123 //^^^^^^^^^^^^^^^^^^^^ missing match arm
124
125 match (false, ((), false)) {
126 (true, ((), true)) => (),
127 (true, ((), false)) => (),
128 (false, ((), true)) => (),
129 (false, ((), false)) => (),
130 }
131 match (false, ((), false)) {
132 (true, ((), true)) => (),
133 (true, ((), false)) => (),
134 (false, _) => (),
135 }
136}
137"#,
138 );
139 }
140
141 #[test]
142 fn enums() {
143 check_diagnostics_no_bails(
144 r#"
145enum Either { A, B, }
146
147fn main() {
148 match Either::A { }
149 //^^^^^^^^^ missing match arm
150 match Either::B { Either::A => (), }
151 //^^^^^^^^^ missing match arm
152
153 match &Either::B {
154 //^^^^^^^^^^ missing match arm
155 Either::A => (),
156 }
157
158 match Either::B {
159 Either::A => (), Either::B => (),
160 }
161 match &Either::B {
162 Either::A => (), Either::B => (),
163 }
164}
165"#,
166 );
167 }
168
169 #[test]
170 fn enum_containing_bool() {
171 check_diagnostics_no_bails(
172 r#"
173enum Either { A(bool), B }
174
175fn main() {
176 match Either::B { }
177 //^^^^^^^^^ missing match arm
178 match Either::B {
179 //^^^^^^^^^ missing match arm
180 Either::A(true) => (), Either::B => ()
181 }
182
183 match Either::B {
184 Either::A(true) => (),
185 Either::A(false) => (),
186 Either::B => (),
187 }
188 match Either::B {
189 Either::B => (),
190 _ => (),
191 }
192 match Either::B {
193 Either::A(_) => (),
194 Either::B => (),
195 }
196
197}
198 "#,
199 );
200 }
201
202 #[test]
203 fn enum_different_sizes() {
204 check_diagnostics_no_bails(
205 r#"
206enum Either { A(bool), B(bool, bool) }
207
208fn main() {
209 match Either::A(false) {
210 //^^^^^^^^^^^^^^^^ missing match arm
211 Either::A(_) => (),
212 Either::B(false, _) => (),
213 }
214
215 match Either::A(false) {
216 Either::A(_) => (),
217 Either::B(true, _) => (),
218 Either::B(false, _) => (),
219 }
220 match Either::A(false) {
221 Either::A(true) | Either::A(false) => (),
222 Either::B(true, _) => (),
223 Either::B(false, _) => (),
224 }
225}
226"#,
227 );
228 }
229
230 #[test]
231 fn tuple_of_enum_no_diagnostic() {
232 check_diagnostics_no_bails(
233 r#"
234enum Either { A(bool), B(bool, bool) }
235enum Either2 { C, D }
236
237fn main() {
238 match (Either::A(false), Either2::C) {
239 (Either::A(true), _) | (Either::A(false), _) => (),
240 (Either::B(true, _), Either2::C) => (),
241 (Either::B(false, _), Either2::C) => (),
242 (Either::B(_, _), Either2::D) => (),
243 }
244}
245"#,
246 );
247 }
248
249 #[test]
250 fn or_pattern_no_diagnostic() {
251 check_diagnostics_no_bails(
252 r#"
253enum Either {A, B}
254
255fn main() {
256 match (Either::A, Either::B) {
257 (Either::A | Either::B, _) => (),
258 }
259}"#,
260 )
261 }
262
263 #[test]
264 fn mismatched_types() {
265 cov_mark::check_count!(validate_match_bailed_out, 4);
266 // Match statements with arms that don't match the
267 // expression pattern do not fire this diagnostic.
268 check_diagnostics(
269 r#"
270enum Either { A, B }
271enum Either2 { C, D }
272
273fn main() {
274 match Either::A {
275 Either2::C => (),
276 Either2::D => (),
277 }
278 match (true, false) {
279 (true, false, true) => (),
280 (true) => (),
281 }
282 match (true, false) { (true,) => {} }
283 match (0) { () => () }
284 match Unresolved::Bar { Unresolved::Baz => () }
285}
286 "#,
287 );
288 }
289
290 #[test]
291 fn mismatched_types_in_or_patterns() {
292 cov_mark::check_count!(validate_match_bailed_out, 2);
293 check_diagnostics(
294 r#"
295fn main() {
296 match false { true | () => {} }
297 match (false,) { (true | (),) => {} }
298}
299"#,
300 );
301 }
302
303 #[test]
304 fn malformed_match_arm_tuple_enum_missing_pattern() {
305 // We are testing to be sure we don't panic here when the match
306 // arm `Either::B` is missing its pattern.
307 check_diagnostics_no_bails(
308 r#"
309enum Either { A, B(u32) }
310
311fn main() {
312 match Either::A {
313 Either::A => (),
314 Either::B() => (),
315 }
316}
317"#,
318 );
319 }
320
321 #[test]
322 fn malformed_match_arm_extra_fields() {
323 cov_mark::check_count!(validate_match_bailed_out, 2);
324 check_diagnostics(
325 r#"
326enum A { B(isize, isize), C }
327fn main() {
328 match A::B(1, 2) {
329 A::B(_, _, _) => (),
330 }
331 match A::B(1, 2) {
332 A::C(_) => (),
333 }
334}
335"#,
336 );
337 }
338
339 #[test]
340 fn expr_diverges() {
341 cov_mark::check_count!(validate_match_bailed_out, 2);
342 check_diagnostics(
343 r#"
344enum Either { A, B }
345
346fn main() {
347 match loop {} {
348 Either::A => (),
349 Either::B => (),
350 }
351 match loop {} {
352 Either::A => (),
353 }
354 match loop { break Foo::A } {
355 //^^^^^^^^^^^^^^^^^^^^^ missing match arm
356 Either::A => (),
357 }
358 match loop { break Foo::A } {
359 Either::A => (),
360 Either::B => (),
361 }
362}
363"#,
364 );
365 }
366
367 #[test]
368 fn expr_partially_diverges() {
369 check_diagnostics_no_bails(
370 r#"
371enum Either<T> { A(T), B }
372
373fn foo() -> Either<!> { Either::B }
374fn main() -> u32 {
375 match foo() {
376 Either::A(val) => val,
377 Either::B => 0,
378 }
379}
380"#,
381 );
382 }
383
384 #[test]
385 fn enum_record() {
386 check_diagnostics_no_bails(
387 r#"
388enum Either { A { foo: bool }, B }
389
390fn main() {
391 let a = Either::A { foo: true };
392 match a { }
393 //^ missing match arm
394 match a { Either::A { foo: true } => () }
395 //^ missing match arm
396 match a {
397 Either::A { } => (),
398 //^^^^^^^^^ Missing structure fields:
399 // | - foo
400 Either::B => (),
401 }
402 match a {
403 //^ missing match arm
404 Either::A { } => (),
405 } //^^^^^^^^^ Missing structure fields:
406 // | - foo
407
408 match a {
409 Either::A { foo: true } => (),
410 Either::A { foo: false } => (),
411 Either::B => (),
412 }
413 match a {
414 Either::A { foo: _ } => (),
415 Either::B => (),
416 }
417}
418"#,
419 );
420 }
421
422 #[test]
423 fn enum_record_fields_out_of_order() {
424 check_diagnostics_no_bails(
425 r#"
426enum Either {
427 A { foo: bool, bar: () },
428 B,
429}
430
431fn main() {
432 let a = Either::A { foo: true, bar: () };
433 match a {
434 //^ missing match arm
435 Either::A { bar: (), foo: false } => (),
436 Either::A { foo: true, bar: () } => (),
437 }
438
439 match a {
440 Either::A { bar: (), foo: false } => (),
441 Either::A { foo: true, bar: () } => (),
442 Either::B => (),
443 }
444}
445"#,
446 );
447 }
448
449 #[test]
450 fn enum_record_ellipsis() {
451 check_diagnostics_no_bails(
452 r#"
453enum Either {
454 A { foo: bool, bar: bool },
455 B,
456}
457
458fn main() {
459 let a = Either::B;
460 match a {
461 //^ missing match arm
462 Either::A { foo: true, .. } => (),
463 Either::B => (),
464 }
465 match a {
466 //^ missing match arm
467 Either::A { .. } => (),
468 }
469
470 match a {
471 Either::A { foo: true, .. } => (),
472 Either::A { foo: false, .. } => (),
473 Either::B => (),
474 }
475
476 match a {
477 Either::A { .. } => (),
478 Either::B => (),
479 }
480}
481"#,
482 );
483 }
484
485 #[test]
486 fn enum_tuple_partial_ellipsis() {
487 check_diagnostics_no_bails(
488 r#"
489enum Either {
490 A(bool, bool, bool, bool),
491 B,
492}
493
494fn main() {
495 match Either::B {
496 //^^^^^^^^^ missing match arm
497 Either::A(true, .., true) => (),
498 Either::A(true, .., false) => (),
499 Either::A(false, .., false) => (),
500 Either::B => (),
501 }
502 match Either::B {
503 //^^^^^^^^^ missing match arm
504 Either::A(true, .., true) => (),
505 Either::A(true, .., false) => (),
506 Either::A(.., true) => (),
507 Either::B => (),
508 }
509
510 match Either::B {
511 Either::A(true, .., true) => (),
512 Either::A(true, .., false) => (),
513 Either::A(false, .., true) => (),
514 Either::A(false, .., false) => (),
515 Either::B => (),
516 }
517 match Either::B {
518 Either::A(true, .., true) => (),
519 Either::A(true, .., false) => (),
520 Either::A(.., true) => (),
521 Either::A(.., false) => (),
522 Either::B => (),
523 }
524}
525"#,
526 );
527 }
528
529 #[test]
530 fn never() {
531 check_diagnostics_no_bails(
532 r#"
533enum Never {}
534
535fn enum_(never: Never) {
536 match never {}
537}
538fn enum_ref(never: &Never) {
539 match never {}
540 //^^^^^ missing match arm
541}
542fn bang(never: !) {
543 match never {}
544}
545"#,
546 );
547 }
548
549 #[test]
550 fn unknown_type() {
551 cov_mark::check_count!(validate_match_bailed_out, 1);
552
553 check_diagnostics(
554 r#"
555enum Option<T> { Some(T), None }
556
557fn main() {
558 // `Never` is deliberately not defined so that it's an uninferred type.
559 match Option::<Never>::None {
560 None => (),
561 Some(never) => match never {},
562 }
563 match Option::<Never>::None {
564 //^^^^^^^^^^^^^^^^^^^^^ missing match arm
565 Option::Some(_never) => {},
566 }
567}
568"#,
569 );
570 }
571
572 #[test]
573 fn tuple_of_bools_with_ellipsis_at_end_missing_arm() {
574 check_diagnostics_no_bails(
575 r#"
576fn main() {
577 match (false, true, false) {
578 //^^^^^^^^^^^^^^^^^^^^ missing match arm
579 (false, ..) => (),
580 }
581}"#,
582 );
583 }
584
585 #[test]
586 fn tuple_of_bools_with_ellipsis_at_beginning_missing_arm() {
587 check_diagnostics_no_bails(
588 r#"
589fn main() {
590 match (false, true, false) {
591 //^^^^^^^^^^^^^^^^^^^^ missing match arm
592 (.., false) => (),
593 }
594}"#,
595 );
596 }
597
598 #[test]
599 fn tuple_of_bools_with_ellipsis_in_middle_missing_arm() {
600 check_diagnostics_no_bails(
601 r#"
602fn main() {
603 match (false, true, false) {
604 //^^^^^^^^^^^^^^^^^^^^ missing match arm
605 (true, .., false) => (),
606 }
607}"#,
608 );
609 }
610
611 #[test]
612 fn record_struct() {
613 check_diagnostics_no_bails(
614 r#"struct Foo { a: bool }
615fn main(f: Foo) {
616 match f {}
617 //^ missing match arm
618 match f { Foo { a: true } => () }
619 //^ missing match arm
620 match &f { Foo { a: true } => () }
621 //^^ missing match arm
622 match f { Foo { a: _ } => () }
623 match f {
624 Foo { a: true } => (),
625 Foo { a: false } => (),
626 }
627 match &f {
628 Foo { a: true } => (),
629 Foo { a: false } => (),
630 }
631}
632"#,
633 );
634 }
635
636 #[test]
637 fn tuple_struct() {
638 check_diagnostics_no_bails(
639 r#"struct Foo(bool);
640fn main(f: Foo) {
641 match f {}
642 //^ missing match arm
643 match f { Foo(true) => () }
644 //^ missing match arm
645 match f {
646 Foo(true) => (),
647 Foo(false) => (),
648 }
649}
650"#,
651 );
652 }
653
654 #[test]
655 fn unit_struct() {
656 check_diagnostics_no_bails(
657 r#"struct Foo;
658fn main(f: Foo) {
659 match f {}
660 //^ missing match arm
661 match f { Foo => () }
662}
663"#,
664 );
665 }
666
667 #[test]
668 fn record_struct_ellipsis() {
669 check_diagnostics_no_bails(
670 r#"struct Foo { foo: bool, bar: bool }
671fn main(f: Foo) {
672 match f { Foo { foo: true, .. } => () }
673 //^ missing match arm
674 match f {
675 //^ missing match arm
676 Foo { foo: true, .. } => (),
677 Foo { bar: false, .. } => ()
678 }
679 match f { Foo { .. } => () }
680 match f {
681 Foo { foo: true, .. } => (),
682 Foo { foo: false, .. } => ()
683 }
684}
685"#,
686 );
687 }
688
689 #[test]
690 fn internal_or() {
691 check_diagnostics_no_bails(
692 r#"
693fn main() {
694 enum Either { A(bool), B }
695 match Either::B {
696 //^^^^^^^^^ missing match arm
697 Either::A(true | false) => (),
698 }
699}
700"#,
701 );
702 }
703
704 #[test]
705 fn no_panic_at_unimplemented_subpattern_type() {
706 cov_mark::check_count!(validate_match_bailed_out, 1);
707
708 check_diagnostics(
709 r#"
710struct S { a: char}
711fn main(v: S) {
712 match v { S{ a } => {} }
713 match v { S{ a: _x } => {} }
714 match v { S{ a: 'a' } => {} }
715 match v { S{..} => {} }
716 match v { _ => {} }
717 match v { }
718 //^ missing match arm
719}
720"#,
721 );
722 }
723
724 #[test]
725 fn binding() {
726 check_diagnostics_no_bails(
727 r#"
728fn main() {
729 match true {
730 _x @ true => {}
731 false => {}
732 }
733 match true { _x @ true => {} }
734 //^^^^ missing match arm
735}
736"#,
737 );
738 }
739
740 #[test]
741 fn binding_ref_has_correct_type() {
742 cov_mark::check_count!(validate_match_bailed_out, 1);
743
744 // Asserts `PatKind::Binding(ref _x): bool`, not &bool.
745 // If that's not true match checking will panic with "incompatible constructors"
746 // FIXME: make facilities to test this directly like `tests::check_infer(..)`
747 check_diagnostics(
748 r#"
749enum Foo { A }
750fn main() {
751 // FIXME: this should not bail out but current behavior is such as the old algorithm.
752 // ExprValidator::validate_match(..) checks types of top level patterns incorrecly.
753 match Foo::A {
754 ref _x => {}
755 Foo::A => {}
756 }
757 match (true,) {
758 (ref _x,) => {}
759 (true,) => {}
760 }
761}
762"#,
763 );
764 }
765
766 #[test]
767 fn enum_non_exhaustive() {
768 check_diagnostics_no_bails(
769 r#"
770//- /lib.rs crate:lib
771#[non_exhaustive]
772pub enum E { A, B }
773fn _local() {
774 match E::A { _ => {} }
775 match E::A {
776 E::A => {}
777 E::B => {}
778 }
779 match E::A {
780 E::A | E::B => {}
781 }
782}
783
784//- /main.rs crate:main deps:lib
785use lib::E;
786fn main() {
787 match E::A { _ => {} }
788 match E::A {
789 //^^^^ missing match arm
790 E::A => {}
791 E::B => {}
792 }
793 match E::A {
794 //^^^^ missing match arm
795 E::A | E::B => {}
796 }
797}
798"#,
799 );
800 }
801
802 #[test]
803 fn match_guard() {
804 check_diagnostics_no_bails(
805 r#"
806fn main() {
807 match true {
808 true if false => {}
809 true => {}
810 false => {}
811 }
812 match true {
813 //^^^^ missing match arm
814 true if false => {}
815 false => {}
816 }
817}
818"#,
819 );
820 }
821
822 #[test]
823 fn pattern_type_is_of_substitution() {
824 cov_mark::check!(match_check_wildcard_expanded_to_substitutions);
825 check_diagnostics_no_bails(
826 r#"
827struct Foo<T>(T);
828struct Bar;
829fn main() {
830 match Foo(Bar) {
831 _ | Foo(Bar) => {}
832 }
833}
834"#,
835 );
836 }
837
838 #[test]
839 fn record_struct_no_such_field() {
840 cov_mark::check_count!(validate_match_bailed_out, 1);
841
842 check_diagnostics(
843 r#"
844struct Foo { }
845fn main(f: Foo) {
846 match f { Foo { bar } => () }
847}
848"#,
849 );
850 }
851
852 #[test]
853 fn match_ergonomics_issue_9095() {
854 check_diagnostics_no_bails(
855 r#"
856enum Foo<T> { A(T) }
857fn main() {
858 match &Foo::A(true) {
859 _ => {}
860 Foo::A(_) => {}
861 }
862}
863"#,
864 );
865 }
866
867 mod false_negatives {
868 //! The implementation of match checking here is a work in progress. As we roll this out, we
869 //! prefer false negatives to false positives (ideally there would be no false positives). This
870 //! test module should document known false negatives. Eventually we will have a complete
871 //! implementation of match checking and this module will be empty.
872 //!
873 //! The reasons for documenting known false negatives:
874 //!
875 //! 1. It acts as a backlog of work that can be done to improve the behavior of the system.
876 //! 2. It ensures the code doesn't panic when handling these cases.
877 use super::*;
878
879 #[test]
880 fn integers() {
881 cov_mark::check_count!(validate_match_bailed_out, 1);
882
883 // We don't currently check integer exhaustiveness.
884 check_diagnostics(
885 r#"
886fn main() {
887 match 5 {
888 10 => (),
889 11..20 => (),
890 }
891}
892"#,
893 );
894 }
895
896 #[test]
897 fn reference_patterns_at_top_level() {
898 cov_mark::check_count!(validate_match_bailed_out, 1);
899
900 check_diagnostics(
901 r#"
902fn main() {
903 match &false {
904 &true => {}
905 }
906}
907 "#,
908 );
909 }
910
911 #[test]
912 fn reference_patterns_in_fields() {
913 cov_mark::check_count!(validate_match_bailed_out, 2);
914
915 check_diagnostics(
916 r#"
917fn main() {
918 match (&false,) {
919 (true,) => {}
920 }
921 match (&false,) {
922 (&true,) => {}
923 }
924}
925 "#,
926 );
927 }
928 }
929}
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-04 05:44:42 +0100