Rollup merge of #64830 - Centril:thou-shallt-not-abort, r=estebank

Thou shallt not `.abort_if_errors()`

r? @estebank

src/librustc/hir/lowering/expr.rs

@@ -705,7 +705,6 @@ impl LoweringContext<'_> {
                         E0628,
                         "generators cannot have explicit parameters"
                     );
-                    self.sess.abort_if_errors();
                 }
                 Some(match movability {
                     Movability::Movable => hir::GeneratorMovability::Movable,
@@ -998,7 +997,7 @@ impl LoweringContext<'_> {
                     E0727,
                     "`async` generators are not yet supported",
                 );
-                self.sess.abort_if_errors();
+                return hir::ExprKind::Err;
             },
             None => self.generator_kind = Some(hir::GeneratorKind::Gen),
         }

src/test/ui/generator/no-parameters-on-generators.rs

@@ -2,6 +2,7 @@
 
 fn main() {
     let gen = |start| { //~ ERROR generators cannot have explicit parameters
+        //~^ ERROR type inside generator must be known in this context
         yield;
     };
 }

src/test/ui/generator/no-parameters-on-generators.stderr

@@ -4,5 +4,18 @@ error[E0628]: generators cannot have explicit parameters
 LL |     let gen = |start| {
    |               ^^^^^^^
 
-error: aborting due to previous error
+error[E0698]: type inside generator must be known in this context
+  --> $DIR/no-parameters-on-generators.rs:4:16
+   |
+LL |     let gen = |start| {
+   |                ^^^^^ cannot infer type
+   |
+note: the type is part of the generator because of this `yield`
+  --> $DIR/no-parameters-on-generators.rs:6:9
+   |
+LL |         yield;
+   |         ^^^^^
 
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0698`.