Ban explicit arguments on generators

2017-07-06 22:08:45 +02:00 · 2017-07-06 22:08:45 +02:00 · b5449b73e6
commit b5449b73e6
parent 81030176dd
1 changed files with 5 additions and 0 deletions
--- a/src/librustc/hir/lowering.rs
+++ b/src/librustc/hir/lowering.rs
@ -1958,6 +1958,11 @@ impl<'a> LoweringContext<'a> {
                            gen = this.impl_arg.map(|_| hir::GeneratorClause::Movable);
                            e
                        });
+                        if gen.is_some() && !decl.inputs.is_empty() {
+                            this.sess.span_fatal(
+                                    fn_decl_span,
+                                    &format!("generators cannot have explicit arguments"));
+                        }
                        hir::ExprClosure(this.lower_capture_clause(capture_clause),
                                         this.lower_fn_decl(decl),
                                         body_id,