Recover gracefully from struct parse errors

Author: estebank

src/librustc_parse/parser/item.rs

@@ -1313,7 +1313,7 @@ impl<'a> Parser<'a> {
         vis: Visibility,
         attrs: Vec<Attribute>,
     ) -> PResult<'a, StructField> {
-        let name = self.parse_ident()?;
+        let name = self.parse_ident_common(false)?;
         self.expect(&token::Colon)?;
         let ty = self.parse_ty()?;
         Ok(StructField {

src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.rs

@@ -2,7 +2,6 @@ pub(crate) struct Bar<T> {
   foo: T,
 
 trait T { //~ ERROR expected identifier, found keyword `trait`
-//~^ ERROR expected `:`, found `T`
     fn foo(&self);
 }
 

src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.stderr

@@ -1,5 +1,5 @@
 error: this file contains an unclosed delimiter
-  --> $DIR/missing-close-brace-in-struct.rs:14:65
+  --> $DIR/missing-close-brace-in-struct.rs:13:65
    |
 LL | pub(crate) struct Bar<T> {
    |                          - unclosed delimiter
@@ -13,11 +13,5 @@ error: expected identifier, found keyword `trait`
 LL | trait T {
    | ^^^^^ expected identifier, found keyword
 
-error: expected `:`, found `T`
-  --> $DIR/missing-close-brace-in-struct.rs:4:7
-   |
-LL | trait T {
-   |       ^ expected `:`
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 

src/test/ui/parser/removed-syntax-field-let.rs

@@ -1,7 +1,6 @@
 struct S {
     let foo: (),
     //~^  ERROR expected identifier, found keyword `let`
-    //~^^ ERROR expected `:`, found `foo`
 }
 
 fn main() {}

src/test/ui/parser/removed-syntax-field-let.stderr

@@ -4,11 +4,5 @@ error: expected identifier, found keyword `let`
 LL |     let foo: (),
    |     ^^^ expected identifier, found keyword
 
-error: expected `:`, found `foo`
-  --> $DIR/removed-syntax-field-let.rs:2:9
-   |
-LL |     let foo: (),
-   |         ^^^ expected `:`
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error