Improved try_macro_suggestion

Author: Duddino

src/librustc_parse/parser/diagnostics.rs

@@ -1054,7 +1054,7 @@ impl<'a> Parser<'a> {
         }
     }
 
-    pub(super) fn try_macro_suggestion(&mut self) -> DiagnosticBuilder<'a> {
+    pub(super) fn try_macro_suggestion(&mut self) -> PResult<'a, P<Expr>> {
         let is_try = self.token.is_keyword(kw::Try);
         let is_questionmark = self.look_ahead(1, |t| t == &token::Not); //check for !
         let is_open = self.look_ahead(2, |t| t == &token::OpenDelim(token::Paren)); //check for (
@@ -1082,9 +1082,10 @@ impl<'a> Parser<'a> {
                 //if the try! macro is empty, it isn't possible to suggest something using the `?` operator
                 err.span_suggestion(lo.shrink_to_lo(), "you can still access the deprecated `try!()` macro using the \"raw identifier\" syntax", "r#".to_string(), Applicability::MachineApplicable);
             }
-            err
+            err.emit();
+            Ok(self.mk_expr_err(lo.to(hi)))
         } else {
-            self.expected_expression_found() // The user isn't trying to invoke the try! macro
+            Err(self.expected_expression_found()) // The user isn't trying to invoke the try! macro
         }
     }
 

src/librustc_parse/parser/expr.rs

@@ -1006,7 +1006,7 @@ impl<'a> Parser<'a> {
                 let expr = self.mk_expr(lo.to(self.prev_token.span), ExprKind::Lit(literal), attrs);
                 self.maybe_recover_from_bad_qpath(expr, true)
             }
-            None => Err(self.try_macro_suggestion()),
+            None => self.try_macro_suggestion(),
         }
     }