1 files changed, 31 insertions, 15 deletions
diff --git a/tests/ui/proc-macro/signature.stderr b/tests/ui/proc-macro/signature.stderr
index 79f2001da..3dbe3f22a 100644
--- a/tests/ui/proc-macro/signature.stderr
+++ b/tests/ui/proc-macro/signature.stderr
@@ -1,20 +1,36 @@
-error[E0277]: expected a `Fn<(proc_macro::TokenStream,)>` closure, found `unsafe extern "C" fn(i32, u32) -> u32 {foo}`
+error: proc macro functions may not be `extern "C"`
   --> $DIR/signature.rs:10:1
    |
-LL | / pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
-LL | |
-LL | |     loop {}
-LL | | }
-   | | ^
-   | | |
-   | |_call the function in a closure: `|| unsafe { /* code */ }`
-   |   required by a bound introduced by this call
+LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: proc macro functions may not be `unsafe`
+  --> $DIR/signature.rs:10:1
+   |
+LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: mismatched derive proc macro signature
+  --> $DIR/signature.rs:10:49
+   |
+LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
+   |                                                 ^^^ found u32, expected type `proc_macro::TokenStream`
+   |
+   = note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
+
+error: mismatched derive proc macro signature
+  --> $DIR/signature.rs:10:33
+   |
+LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
+   |                                 ^^^ found i32, expected type `proc_macro::TokenStream`
+   |
+   = note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
+
+error: mismatched derive proc macro signature
+  --> $DIR/signature.rs:10:38
    |
-   = help: the trait `Fn<(proc_macro::TokenStream,)>` is not implemented for fn item `unsafe extern "C" fn(i32, u32) -> u32 {foo}`
-   = note: unsafe function cannot be called generically without an unsafe block
-note: required by a bound in `ProcMacro::custom_derive`
-  --> $SRC_DIR/proc_macro/src/bridge/client.rs:LL:COL
+LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
+   |                                      ^^^^^^ found unexpected argument
 
-error: aborting due to previous error
+error: aborting due to 5 previous errors
 
-For more information about this error, try `rustc --explain E0277`.