error: attribute proc macro has incorrect signature
  --> $DIR/signature-proc-macro-attribute.rs:10:1
   |
LL | pub fn bad_input(input: String) -> TokenStream {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
   |
   = note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
              found signature `fn(std::string::String) -> proc_macro::TokenStream`

error: attribute proc macro has incorrect signature
  --> $DIR/signature-proc-macro-attribute.rs:16:1
   |
LL | pub fn bad_output(input: TokenStream) -> String {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
   |
   = note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
              found signature `fn(proc_macro::TokenStream) -> std::string::String`

error: attribute proc macro has incorrect signature
  --> $DIR/signature-proc-macro-attribute.rs:22:1
   |
LL | pub fn bad_everything(input: String) -> String {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
   |
   = note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
              found signature `fn(std::string::String) -> std::string::String`

error: attribute proc macro has incorrect signature
  --> $DIR/signature-proc-macro-attribute.rs:28:52
   |
LL | pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
   |                                                    ^^^^^^ incorrect number of function parameters
   |
   = note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
              found signature `fn(proc_macro::TokenStream, proc_macro::TokenStream, std::string::String) -> proc_macro::TokenStream`

error: aborting due to 4 previous errors