Merge #655

655: Fix type inference of binops on int/float variables r=matklad a=flodiebold

Fixes #651.

Co-authored-by: Florian Diebold <flodiebold@gmail.com>

crates/ra_hir/src/ty.rs

@@ -790,7 +790,10 @@ fn binary_op_return_ty(op: BinaryOp, rhs_ty: Ty) -> Ty {
         | BinaryOp::BitwiseAnd
         | BinaryOp::BitwiseOr
         | BinaryOp::BitwiseXor => match rhs_ty {
-            Ty::Int(..) | Ty::Float(..) => rhs_ty,
+            Ty::Int(..)
+            | Ty::Float(..)
+            | Ty::Infer(InferTy::IntVar(..))
+            | Ty::Infer(InferTy::FloatVar(..)) => rhs_ty,
             _ => Ty::Unknown,
         },
         BinaryOp::RangeRightOpen | BinaryOp::RangeRightClosed => Ty::Unknown,

crates/ra_hir/src/ty/snapshots/tests__bug_651.snap

@@ -0,0 +1,13 @@
+---
+created: "2019-01-25T20:31:47.275112244+00:00"
+creator: insta@0.5.2
+expression: "&result"
+source: crates/ra_hir/src/ty/tests.rs
+---
+[11; 41) '{     ...+ y; }': ()
+[21; 22) 'y': i32
+[25; 27) '92': i32
+[33; 34) '1': i32
+[33; 38) '1 + y': i32
+[37; 38) 'y': i32
+

crates/ra_hir/src/ty/tests.rs

@@ -532,6 +532,19 @@ fn test() {
     );
 }
 
+#[test]
+fn bug_651() {
+    check_inference(
+        "bug_651",
+        r#"
+fn quux() {
+    let y = 92;
+    1 + y;
+}
+"#,
+    );
+}
+
 fn infer(content: &str) -> String {
     let (db, _, file_id) = MockDatabase::with_single_file(content);
     let source_file = db.source_file(file_id);