Continune parsing after encountering Trait with paren args

Author: estebank

src/librustc/hir/lowering.rs

@@ -1826,7 +1826,7 @@ impl<'a> LoweringContext<'a> {
                         struct_span_err!(self.sess, data.span, E0214, "{}", msg)
                             .span_label(data.span, "only traits may use parentheses")
                             .emit();
-                        (hir::GenericArgs::none(), true)
+                        (hir::GenericArgs::none(), false)
                     }
                 },
             }

src/test/ui/error-codes/E0214.stderr

@@ -4,6 +4,13 @@ error[E0214]: parenthesized parameters may only be used with a trait
 LL |     let v: Vec(&str) = vec!["foo"];
    |               ^^^^^^ only traits may use parentheses
 
-error: aborting due to previous error
+error[E0107]: wrong number of type arguments: expected 1, found 0
+  --> $DIR/E0214.rs:2:12
+   |
+LL |     let v: Vec(&str) = vec!["foo"];
+   |            ^^^^^^^^^ expected 1 type argument
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0214`.
+Some errors occurred: E0107, E0214.
+For more information about an error, try `rustc --explain E0107`.

src/test/ui/issues/issue-23589.stderr

@@ -4,6 +4,13 @@ error[E0214]: parenthesized parameters may only be used with a trait
 LL |     let v: Vec(&str) = vec!['1', '2'];
    |               ^^^^^^ only traits may use parentheses
 
-error: aborting due to previous error
+error[E0107]: wrong number of type arguments: expected 1, found 0
+  --> $DIR/issue-23589.rs:2:12
+   |
+LL |     let v: Vec(&str) = vec!['1', '2'];
+   |            ^^^^^^^^^ expected 1 type argument
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0214`.
+Some errors occurred: E0107, E0214.
+For more information about an error, try `rustc --explain E0107`.

src/test/ui/unboxed-closures/unboxed-closure-sugar-used-on-struct-1.stderr

@@ -4,6 +4,13 @@ error[E0214]: parenthesized parameters may only be used with a trait
 LL |     let x: Box<Bar()> = panic!();
    |                   ^^ only traits may use parentheses
 
-error: aborting due to previous error
+error[E0107]: wrong number of type arguments: expected 1, found 0
+  --> $DIR/unboxed-closure-sugar-used-on-struct-1.rs:8:16
+   |
+LL |     let x: Box<Bar()> = panic!();
+   |                ^^^^^ expected 1 type argument
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0214`.
+Some errors occurred: E0107, E0214.
+For more information about an error, try `rustc --explain E0107`.

src/test/ui/unboxed-closures/unboxed-closure-sugar-used-on-struct-3.stderr

@@ -4,6 +4,13 @@ error[E0214]: parenthesized parameters may only be used with a trait
 LL |     let b = Bar::(isize, usize)::new(); // OK too (for the parser)
    |                ^^^^^^^^^^^^^^^^ only traits may use parentheses
 
-error: aborting due to previous error
+error[E0107]: wrong number of type arguments: expected 2, found 0
+  --> $DIR/unboxed-closure-sugar-used-on-struct-3.rs:14:13
+   |
+LL |     let b = Bar::(isize, usize)::new(); // OK too (for the parser)
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^ expected 2 type arguments
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0214`.
+Some errors occurred: E0107, E0214.
+For more information about an error, try `rustc --explain E0107`.

src/test/ui/unboxed-closures/unboxed-closure-sugar-used-on-struct.stderr

@@ -4,13 +4,13 @@ error[E0214]: parenthesized parameters may only be used with a trait
 LL | fn foo(b: Box<Bar()>) {
    |                  ^^ only traits may use parentheses
 
-error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+error[E0107]: wrong number of type arguments: expected 1, found 0
   --> $DIR/unboxed-closure-sugar-used-on-struct.rs:7:15
    |
 LL | fn foo(b: Box<Bar()>) {
-   |               ^^^^^ not allowed in type signatures
+   |               ^^^^^ expected 1 type argument
 
 error: aborting due to 2 previous errors
 
-Some errors occurred: E0121, E0214.
-For more information about an error, try `rustc --explain E0121`.
+Some errors occurred: E0107, E0214.
+For more information about an error, try `rustc --explain E0107`.