Recovery

Author: petrochenkov

src/librustc_parse/parser/stmt.rs

@@ -216,8 +216,17 @@ impl<'a> Parser<'a> {
     }
 
     /// Parses the RHS of a local variable declaration (e.g., '= 14;').
-    fn parse_initializer(&mut self, skip_eq: bool) -> PResult<'a, Option<P<Expr>>> {
-        if self.eat(&token::Eq) || skip_eq { Ok(Some(self.parse_expr()?)) } else { Ok(None) }
+    fn parse_initializer(&mut self, eq_optional: bool) -> PResult<'a, Option<P<Expr>>> {
+        let eq_consumed = match self.token.kind {
+            token::BinOpEq(..) => {
+                self.struct_span_err(self.token.span, "blah").emit();
+                self.bump();
+                true
+            }
+            _ => self.eat(&token::Eq),
+        };
+
+        Ok(if eq_consumed || eq_optional { Some(self.parse_expr()?) } else { None })
     }
 
     /// Parses a block. No inner attributes are allowed.

src/test/ui/parser/let-binop.rs

@@ -1,8 +1,8 @@
 fn main() {
-    let a: i8 *= 1; //~ ERROR expected one of `!`, `(`, `+`, `::`, `;`, `<`, or `=`, found `*=`
+    let a: i8 *= 1; //~ ERROR blah
     let _ = a;
-    let b += 1;
+    let b += 1; //~ ERROR blah
     let _ = b;
-    let c *= 1;
+    let c *= 1; //~ ERROR blah
     let _ = c;
 }

src/test/ui/parser/let-binop.stderr

@@ -1,8 +1,20 @@
-error: expected one of `!`, `(`, `+`, `::`, `;`, `<`, or `=`, found `*=`
+error: blah
   --> $DIR/let-binop.rs:2:15
    |
 LL |     let a: i8 *= 1;
-   |               ^^ expected one of 7 possible tokens
+   |               ^^
 
-error: aborting due to previous error
+error: blah
+  --> $DIR/let-binop.rs:4:11
+   |
+LL |     let b += 1;
+   |           ^^
+
+error: blah
+  --> $DIR/let-binop.rs:6:11
+   |
+LL |     let c *= 1;
+   |           ^^
+
+error: aborting due to 3 previous errors