rustc: Implement "deriving" for monomorphic structs via a syntax extensi...

[pcwalton]

...on

r? @brson

[brson]

r+

[brson]

There's a module of builder functions in ext::build that are partially redundant with some here, and some of the ones you've written deserve to be in build.

Things that exist in build:

• plain_path is similar to mk_raw_path
• create_expr -> mk_expr
• plain_expr_path -> mk_path

Things that could go in build:

• plain_pattern, plain_expr_lit_bool, plain_block

[brson]

r+

[brson]

This is very well commented

[brson]

I actually can't picture the code generated by expand_deriving_enum_method after reading it quite a bit. A comment illustrating the pattern being implemented would help.

[pcwalton]

r? @brson

[brson]

r+

[brson]

r+