Rename directories for some crates from `syntax_x` to `rustc_x`

2019-12-30T16:18:16+00:00

`syntax_expand` -> `rustc_expand` `syntax_pos` -> `rustc_span` `syntax_ext` -> `rustc_builtin_macros`

Format the world

2019-12-22T22:42:47+00:00

Remove `PartialEq` and `Eq` from the `SpecialDerives`.

2019-11-05T13:58:10+00:00

rustc, rustc_passes: don't depend on syntax_expand.

2019-10-27T16:05:57+00:00

This is done by moving some data definitions to syntax::expand.

Migrate from `#[structural_match]` attribute a lang-item trait.

2019-10-25T12:52:07+00:00

(Or more precisely, a pair of such traits: one for `derive(PartialEq)` and one for `derive(Eq)`.) ((The addition of the second marker trait, `StructuralEq`, is largely a hack to work-around `fn (&T)` not implementing `PartialEq` and `Eq`; see also issue rust-lang/rust#46989; otherwise I would just check if `Eq` is implemented.)) Note: this does not use trait fulfillment error-reporting machinery; it just uses the trait system to determine if the ADT was tagged or not. (Nonetheless, I have kept an `on_unimplemented` message on the new trait for structural_match check, even though it is currently not used.) Note also: this does *not* resolve the ICE from rust-lang/rust#65466, as noted in a comment added in this commit. Further work is necessary to resolve that and other problems with the structural match checking, especially to do so without breaking stable code (adapted from test fn-ptr-is-structurally-matchable.rs): ```rust fn r_sm_to(_: &SM) {} fn main() { const CFN6: Wrap = Wrap(r_sm_to); let input: Wrap = Wrap(r_sm_to); match Wrap(input) { Wrap(CFN6) => {} Wrap(_) => {} }; } ``` where we would hit a problem with the strategy of unconditionally checking for `PartialEq` because the type `for <'a> fn(&'a SM)` does not currently even *implement* `PartialEq`. ---- added review feedback: * use an or-pattern * eschew `return` when tail position will do. * don't need fresh_expansion; just add `structural_match` to appropriate `allow_internal_unstable` attributes. also fixed example in doc comment so that it actually compiles.

move syntax::ext to new crate syntax_expand

2019-10-16T08:59:53+00:00

Inline attribute constructors

2019-09-21T20:14:10+00:00

Remove constraints argument from path_all

2019-09-21T19:01:39+00:00

It was never used

Give more `Idents` spans

2019-09-15T08:15:38+00:00

or-patterns: syntax: adjust derive, format, and building.

2019-09-05T06:33:09+00:00

rust/src/libsyntax_ext/deriving/cmp, branch perf-tmp