Commits on Jul 15, 2018

1. Use local_inner_macros to resolve all helper macros within $crate …

   This fixes the following error when using Rust 2018 style macro imports.
   
       extern crate lazy_static;
       use lazy_static::lazy_static;
   
       error: cannot find macro `__lazy_static_internal!` in this scope
         --> src/main.rs:8:1
          |
       8  | / lazy_static! {
       9  | |     static ref M: HashMap<String, String> = HashMap::new();
       10 | | }
          | |_^
          |
   
   The `local_inner_macros` modifier resolves all macro invocations made
   from within that macro as helpers in the same crate. So if
   `lazy_static!` expands to an invocation of `__lazy_static_internal!`
   then this would be resolved as `$crate::__lazy_static_internal!` rather
   than requiring the caller to have `__lazy_static_internal` in scope.
   
   The attribute is ignored by pre-2018 compilers so lazy_static will
   continue to work as normal with #[macro_use].
   
   In the future when dropping compatibility with pre-2018 compilers we can
   remove the `local_inner_macros` modifier and use our own explicit
   `$crate::` prefixes on invocations of helper macros.

   

   dtolnay committed Jul 15, 2018
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