1 files changed, 40 insertions, 0 deletions
diff --git a/tests/ui/proc-macro/signature-proc-macro.stderr b/tests/ui/proc-macro/signature-proc-macro.stderr
new file mode 100644
index 000000000..4b14a54e6
--- /dev/null
+++ b/tests/ui/proc-macro/signature-proc-macro.stderr
@@ -0,0 +1,40 @@
+error: mismatched function-like proc macro signature
+  --> $DIR/signature-proc-macro.rs:10:25
+   |
+LL | pub fn bad_input(input: String) -> TokenStream {
+   |                         ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
+   |
+   = note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
+
+error: mismatched function-like proc macro signature
+  --> $DIR/signature-proc-macro.rs:16:42
+   |
+LL | pub fn bad_output(input: TokenStream) -> String {
+   |                                          ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
+   |
+   = note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
+
+error: mismatched function-like proc macro signature
+  --> $DIR/signature-proc-macro.rs:22:41
+   |
+LL | pub fn bad_everything(input: String) -> String {
+   |                                         ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
+   |
+   = note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
+
+error: mismatched function-like proc macro signature
+  --> $DIR/signature-proc-macro.rs:22:30
+   |
+LL | pub fn bad_everything(input: String) -> String {
+   |                              ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
+   |
+   = note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
+
+error: mismatched function-like proc macro signature
+  --> $DIR/signature-proc-macro.rs:29:33
+   |
+LL | pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
+   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ found unexpected arguments
+
+error: aborting due to 5 previous errors
+