dtolnay
diff --git a/‎src/ty.rs‎
Lines changed: 4 additions & 0 deletions b/‎src/ty.rs‎
Lines changed: 4 additions & 0 deletions
@@ -949,6 +949,10 @@ pub mod parsing {
                             break;
                         }
                     }
+                    // Just lifetimes like `impl 'a` is not an ImplTrait.
+                    if !at_least_one_type(&bounds) {
+                        return Err(input.error("expected at least one type"));
+                    }
                     bounds
                 },
             })
Original file line number	Diff line number	Diff line change
`@@ -949,6 +949,10 @@ pub mod parsing {`
`949`	`949`	`break;`
`950`	`950`	`}`
`951`	`951`	`}`
	`952`	+ // Just lifetimes like `impl 'a` is not an ImplTrait.
	`953`	`+ if !at_least_one_type(&bounds) {`
	`954`	`+ return Err(input.error("expected at least one type"));`
	`955`	`+ }`
`952`	`956`	`bounds`
`953`	`957`	`},`
`954`	`958`	`})`