Andrew Kelley f885a1ab61 change async function call syntax
* instead of `async(allocator) call()`, now it is
   `async<allocator> call()`.
 * Fixes syntax ambiguity when leaving off the allocator
 * Fixes parse failure when call is a field access

This sets a precedent for using `<` to pass arguments
to a keyword. This will affect `enum`, `union`, and
`fn` (see #661)
2018-03-21 19:56:41 -04:00
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