Merge #332

332: Struct types r=matklad a=flodiebold

Infer types for struct fields, and add basic field completions. There's also some code for enums, but I focused on getting structs working.

There's still ways to go before this becomes useful: There's no autoderef (or even reference types) and no inference for `self`, for example.

Co-authored-by: Florian Diebold <[email protected]>

4 files changed, 86 insertions, 2 deletions

diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index b6c02cd80..a76925b58 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -68,6 +68,51 @@ fn test() {
     );
 }
 
+#[test]
+fn infer_struct() {
+    check_inference(
+        r#"
+struct A {
+    b: B,
+    c: C,
+}
+struct B;
+struct C(usize);
+
+fn test() {
+    let c = C(1);
+    B;
+    let a: A = A { b: B, c: C(1) };
+    a.b;
+    a.c;
+}
+"#,
+        "0004_struct.txt",
+    );
+}
+
+#[test]
+fn infer_refs_and_ptrs() {
+    check_inference(
+        r#"
+fn test(a: &u32, b: &mut u32, c: *const u32, d: *mut u32) {
+    a;
+    *a;
+    &a;
+    &mut a;
+    b;
+    *b;
+    &b;
+    c;
+    *c;
+    d;
+    *d;
+}
+"#,
+        "0005_refs.txt",
+    );
+}
+
 fn infer(content: &str) -> String {
     let (db, _, file_id) = MockDatabase::with_single_file(content);
     let source_file = db.source_file(file_id);
diff --git a/crates/ra_hir/src/ty/tests/data/0001_basics.txt b/crates/ra_hir/src/ty/tests/data/0001_basics.txt
index 0c46f243a..212e92e00 100644
--- a/crates/ra_hir/src/ty/tests/data/0001_basics.txt
+++ b/crates/ra_hir/src/ty/tests/data/0001_basics.txt
@@ -1,4 +1,4 @@
-[33; 34) 'd': [unknown]
+[33; 34) 'd': &[unknown]
 [88; 94) '1isize': [unknown]
 [48; 49) 'a': u32
 [55; 56) 'b': isize
@@ -10,4 +10,4 @@
 [17; 18) 'b': isize
 [100; 106) '"test"': [unknown]
 [42; 121) '{     ...f32; }': ()
-[69; 70) 'd': [unknown]
+[69; 70) 'd': &[unknown]
diff --git a/crates/ra_hir/src/ty/tests/data/0004_struct.txt b/crates/ra_hir/src/ty/tests/data/0004_struct.txt
new file mode 100644
index 000000000..cc8f3665b
--- /dev/null
+++ b/crates/ra_hir/src/ty/tests/data/0004_struct.txt
@@ -0,0 +1,16 @@
+[86; 90) 'C(1)': [unknown]
+[121; 122) 'B': [unknown]
+[86; 87) 'C': [unknown]
+[129; 130) '1': [unknown]
+[107; 108) 'a': A
+[127; 128) 'C': [unknown]
+[139; 142) 'a.b': B
+[114; 133) 'A { b:...C(1) }': A
+[148; 151) 'a.c': C
+[148; 149) 'a': A
+[139; 140) 'a': A
+[72; 154) '{     ...a.c; }': ()
+[96; 97) 'B': [unknown]
+[88; 89) '1': [unknown]
+[82; 83) 'c': [unknown]
+[127; 131) 'C(1)': [unknown]
diff --git a/crates/ra_hir/src/ty/tests/data/0005_refs.txt b/crates/ra_hir/src/ty/tests/data/0005_refs.txt
new file mode 100644
index 000000000..296e955c1
--- /dev/null
+++ b/crates/ra_hir/src/ty/tests/data/0005_refs.txt
@@ -0,0 +1,23 @@
+[115; 117) '&b': &&mut u32
+[88; 94) '&mut a': &mut &u32
+[146; 147) 'd': *mut u32
+[145; 147) '*d': u32
+[65; 66) 'a': &u32
+[46; 47) 'd': *mut u32
+[59; 150) '{     ... *d; }': ()
+[116; 117) 'b': &mut u32
+[131; 132) 'c': *const u32
+[130; 132) '*c': u32
+[72; 74) '*a': u32
+[107; 109) '*b': u32
+[108; 109) 'b': &mut u32
+[9; 10) 'a': &u32
+[18; 19) 'b': &mut u32
+[93; 94) 'a': &u32
+[100; 101) 'b': &mut u32
+[81; 82) 'a': &u32
+[80; 82) '&a': &&u32
+[73; 74) 'a': &u32
+[123; 124) 'c': *const u32
+[31; 32) 'c': *const u32
+[138; 139) 'd': *mut u32