rustc: Rename rustc_macro to proc_macro

[alexcrichton]

This commit blanket renames the rustc_macro infrastructure to proc_macro,
which reflects the general consensus of #35900. A follow up PR to Cargo will be
required to purge the rustc-macro name as well.

[rust-highfive]

r? @nikomatsakis

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[alexcrichton]

r? @nrc

cc @dtolnay, @sgrif

This is a [breaking-change] from the current implementation, just blindly renaming everything. I'm curious what you think, though, about this strategy. Do you think it's worth implementing the infrastructure to ensure a smooth transition? It unfortunately wouldn't be easy but it also wouldn't be impossible.

Also one point I forgot to mention was that the existing proc_macro has been blanket renamed to proc_macro_plugin, but I think that most of it can move to proc_macro. I figured that could be left to a future PR, however.

[dtolnay]

I think this is fine without infrastructure to ensure a smooth transition. We'll just fix everything when the nightly comes out, same as usual.

[sgrif]

Yeah I'm pretty sure this breaks diesel, serde, and maybe 1-2 other crates. We'll be fine. Just 😄

[sgrif]

Way better than 1.0

[nrc]

@bors: r+

[bors]

📌 Commit 903338b has been approved by nrc

[Mark-Simulacrum]

Travis failed:

error[E0061]: this function takes 0 parameters but 1 parameter was supplied
   --> src/libserialize/json.rs:436:26
    |
436 |     escape_str(writer, v.encode_utf8(&mut [0; 4]))
    |                          ^^^^^^^^^^^ expected 0 parameters

error[E0308]: mismatched types
   --> src/libserialize/json.rs:436:24
    |
436 |     escape_str(writer, v.encode_utf8(&mut [0; 4]))
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected &str, found struct `rustc_unicode::char::EncodeUtf8`
    |
    = note: expected type `&str`
    = note:    found type `rustc_unicode::char::EncodeUtf8`

error: aborting due to 2 previous errors

[alexcrichton]

@bors: r-

[alexcrichton]

@bors: r=nrc

[bors]

📌 Commit d4a29c9 has been approved by nrc

[bors]

⌛ Testing commit d4a29c9 with merge 8aef157...

[alexcrichton]

@bors: retry force clean

• restarted buildbot

[bors]

⌛ Testing commit d4a29c9 with merge 81e34f8...

[bors]

💔 Test failed - auto-win-msvc-64-cargotest

[nrc]

@bors: retry

[alexcrichton]

@bors: r-

That's legit I think, gotta update Cargo

[alexcrichton]

@bors: r=nrc

[bors]

📌 Commit 2148bdf has been approved by nrc

[bors]

⌛ Testing commit 2148bdf with merge ca76c7e...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-cargotest, auto-linux-64-cross-freebsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-rustbuild
Approved by: nrc
Pushing ca76c7e to master...