error: function-like proc macro has incorrect signature --> $DIR/signature-proc-macro.rs:10:25 | LL | pub fn bad_input(input: String) -> TokenStream { | ^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String` | = note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream` found signature `fn(std::string::String) -> proc_macro::TokenStream` error: function-like proc macro has incorrect signature --> $DIR/signature-proc-macro.rs:16:42 | LL | pub fn bad_output(input: TokenStream) -> String { | ^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String` | = note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream` found signature `fn(proc_macro::TokenStream) -> std::string::String` error: function-like proc macro has incorrect signature --> $DIR/signature-proc-macro.rs:22:30 | LL | pub fn bad_everything(input: String) -> String { | ^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String` | = note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream` found signature `fn(std::string::String) -> std::string::String` error: function-like proc macro has incorrect signature --> $DIR/signature-proc-macro.rs:28:36 | 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` found signature `fn(proc_macro::TokenStream, proc_macro::TokenStream, std::string::String) -> proc_macro::TokenStream` error: aborting due to 4 previous errors