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]>

2 files changed, 38 insertions, 0 deletions

diff --git a/crates/ra_syntax/tests/data/parser/err/0029_field_completion.rs b/crates/ra_syntax/tests/data/parser/err/0029_field_completion.rs
new file mode 100644
index 000000000..a7cdc17bb
--- /dev/null
+++ b/crates/ra_syntax/tests/data/parser/err/0029_field_completion.rs
@@ -0,0 +1,3 @@
+fn foo(a: A) {
+    a.
+}
diff --git a/crates/ra_syntax/tests/data/parser/err/0029_field_completion.txt b/crates/ra_syntax/tests/data/parser/err/0029_field_completion.txt
new file mode 100644
index 000000000..fd2a3f37b
--- /dev/null
+++ b/crates/ra_syntax/tests/data/parser/err/0029_field_completion.txt
@@ -0,0 +1,35 @@
+SOURCE_FILE@[0; 24)
+  FN_DEF@[0; 23)
+    FN_KW@[0; 2)
+    WHITESPACE@[2; 3)
+    NAME@[3; 6)
+      IDENT@[3; 6) "foo"
+    PARAM_LIST@[6; 12)
+      L_PAREN@[6; 7)
+      PARAM@[7; 11)
+        BIND_PAT@[7; 8)
+          NAME@[7; 8)
+            IDENT@[7; 8) "a"
+        COLON@[8; 9)
+        WHITESPACE@[9; 10)
+        PATH_TYPE@[10; 11)
+          PATH@[10; 11)
+            PATH_SEGMENT@[10; 11)
+              NAME_REF@[10; 11)
+                IDENT@[10; 11) "A"
+      R_PAREN@[11; 12)
+    WHITESPACE@[12; 13)
+    BLOCK@[13; 23)
+      L_CURLY@[13; 14)
+      WHITESPACE@[14; 19)
+      FIELD_EXPR@[19; 21)
+        PATH_EXPR@[19; 20)
+          PATH@[19; 20)
+            PATH_SEGMENT@[19; 20)
+              NAME_REF@[19; 20)
+                IDENT@[19; 20) "a"
+        DOT@[20; 21)
+        err: `expected field name or number`
+      WHITESPACE@[21; 22)
+      R_CURLY@[22; 23)
+  WHITESPACE@[23; 24)