Commits on Nov 12, 2021

1. proc_macro: Add an expand_expr method to TokenStream …

   This feature is aimed at giving proc macros access to powers similar to
   those used by builtin macros such as `format_args!` or `concat!`. These
   macros are able to accept macros in place of string literal parameters,
   such as the format string, as they perform recursive macro expansion
   while being expanded.
   
   This can be especially useful in many cases thanks to helper macros like
   `concat!`, `stringify!` and `include_str!` which are often used to
   construct string literals at compile-time in user code.
   
   For now, this method only allows expanding macros which produce
   literals, although more expresisons will be supported before the method
   is stabilized.

   

   mystor committed Nov 12, 2021
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