Attribute Macro proc_macro_error::proc_macro_error

#[proc_macro_error]

Either this attribute or proc_macro_error::entry_point MUST be present on the top level of your macro.

This attribute helps you build the right entry_point invocation while keeping the indentation level.

Syntax

#[proc_macro_error] or #[proc_macro_error(settings...)], where settings... is a comma-separated list of:

• assert_unwind_safe:

  Tells proc_macro_error that the code passed to proc_macro_error::entry_point should we wrapped with AssertUnwindSafe.

• allow_not_macro:

  By default, the attribute checks that it's applied to a proc-macro. If none of #[proc_macro], #[proc_macro_derive] nor #[proc_macro_attribute] are present it will panic. It's the intention - this crate is supposed to be used only with proc-macros. By applying this setting you're bypassing this check, useful in certain circumstances.