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authoradamrk <[email protected]>2020-06-25 22:05:55 +0100
committeradamrk <[email protected]>2020-06-25 22:16:58 +0100
commit0ebc24043bb267cf77ddd6c1d8b7d5ad9f82444d (patch)
treef311230e61cfb4014e0332a6abe701b7a0d19594 /crates
parent3615347fcebebaa58a5cbf675ae062aae149d9c3 (diff)
Infer type for slice wildcard patterns
Diffstat (limited to 'crates')
-rw-r--r--crates/ra_hir_ty/src/infer/pat.rs9
-rw-r--r--crates/ra_hir_ty/src/tests/patterns.rs25
-rw-r--r--crates/ra_hir_ty/src/tests/regression.rs2
3 files changed, 34 insertions, 2 deletions
diff --git a/crates/ra_hir_ty/src/infer/pat.rs b/crates/ra_hir_ty/src/infer/pat.rs
index 23de2bd6b..4dd4f9802 100644
--- a/crates/ra_hir_ty/src/infer/pat.rs
+++ b/crates/ra_hir_ty/src/infer/pat.rs
@@ -184,7 +184,7 @@ impl<'a> InferenceContext<'a> {
184 self.write_pat_ty(pat, bound_ty); 184 self.write_pat_ty(pat, bound_ty);
185 return inner_ty; 185 return inner_ty;
186 } 186 }
187 Pat::Slice { prefix, slice: _slice, suffix } => { 187 Pat::Slice { prefix, slice, suffix } => {
188 let (container_ty, elem_ty) = match &expected { 188 let (container_ty, elem_ty) = match &expected {
189 ty_app!(TypeCtor::Array, st) => (TypeCtor::Array, st.as_single().clone()), 189 ty_app!(TypeCtor::Array, st) => (TypeCtor::Array, st.as_single().clone()),
190 ty_app!(TypeCtor::Slice, st) => (TypeCtor::Slice, st.as_single().clone()), 190 ty_app!(TypeCtor::Slice, st) => (TypeCtor::Slice, st.as_single().clone()),
@@ -195,7 +195,12 @@ impl<'a> InferenceContext<'a> {
195 self.infer_pat(*pat_id, &elem_ty, default_bm); 195 self.infer_pat(*pat_id, &elem_ty, default_bm);
196 } 196 }
197 197
198 Ty::apply_one(container_ty, elem_ty) 198 let pat_ty = Ty::apply_one(container_ty, elem_ty);
199 if let Some(slice_pat_id) = slice {
200 self.infer_pat(*slice_pat_id, &pat_ty, default_bm);
201 }
202
203 pat_ty
199 } 204 }
200 Pat::Wild => expected.clone(), 205 Pat::Wild => expected.clone(),
201 Pat::Range { start, end } => { 206 Pat::Range { start, end } => {
diff --git a/crates/ra_hir_ty/src/tests/patterns.rs b/crates/ra_hir_ty/src/tests/patterns.rs
index e5ef241ca..f937426bd 100644
--- a/crates/ra_hir_ty/src/tests/patterns.rs
+++ b/crates/ra_hir_ty/src/tests/patterns.rs
@@ -627,3 +627,28 @@ fn test() {
627 "### 627 "###
628 ); 628 );
629} 629}
630
631#[test]
632fn slice_tail_pattern() {
633 assert_snapshot!(
634 infer(r#"
635fn foo(params: &[i32]) {
636 match params {
637 [head, tail @ ..] => {
638 }
639 }
640}
641"#),
642 @r###"
643 7..13 'params': &[i32]
644 23..92 '{ ... } }': ()
645 29..90 'match ... }': ()
646 35..41 'params': &[i32]
647 52..69 '[head,... @ ..]': [i32]
648 53..57 'head': &i32
649 59..68 'tail @ ..': &[i32]
650 66..68 '..': [i32]
651 73..84 '{ }': ()
652 "###
653 );
654}
diff --git a/crates/ra_hir_ty/src/tests/regression.rs b/crates/ra_hir_ty/src/tests/regression.rs
index eedaa27ba..aa37326df 100644
--- a/crates/ra_hir_ty/src/tests/regression.rs
+++ b/crates/ra_hir_ty/src/tests/regression.rs
@@ -500,6 +500,8 @@ fn foo(params: &[usize]) {
500 31..78 'match ... }': () 500 31..78 'match ... }': ()
501 37..43 'params': &[usize] 501 37..43 'params': &[usize]
502 54..66 '[ps @ .., _]': [usize] 502 54..66 '[ps @ .., _]': [usize]
503 55..62 'ps @ ..': &[usize]
504 60..62 '..': [usize]
503 64..65 '_': usize 505 64..65 '_': usize
504 70..72 '{}': () 506 70..72 '{}': ()
505 "### 507 "###