Don't feature gate bang macros on 'proc_macro_path_invoc'.

[SergioBenitez]

Fixes oversight from #50120.

[rust-highfive]

r? @michaelwoerister

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[SergioBenitez]

r? @alexcrichton

[alexcrichton]

@bors: r+

Awesome, thanks @SergioBenitez!

[bors]

📌 Commit f756b07 has been approved by alexcrichton

[petrochenkov]

This is a breaking regression, so maybe let's land it faster.
@bors p=1

[bors]

⌛ Testing commit f756b07 with merge 7c1fd19fceaab184f1e5d32e82ffb6674f2df74c...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job dist-x86_64-linux-alt of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

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[00:31:53] [RUSTC-TIMING] rustc_target test:false 25.050
[00:31:54] [RUSTC-TIMING] syntax_pos test:false 10.427
[00:31:54]    Compiling rustc_errors v0.0.0 (file:///checkout/src/librustc_errors)
[00:32:05] [RUSTC-TIMING] rustc_errors test:false 10.930
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
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[rust-highfive]

The job dist-x86_64-linux-alt of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:31:53] [RUSTC-TIMING] rustc_target test:false 25.050
[00:31:54] [RUSTC-TIMING] syntax_pos test:false 10.427
[00:31:54]    Compiling rustc_errors v0.0.0 (file:///checkout/src/librustc_errors)
[00:32:05] [RUSTC-TIMING] rustc_errors test:false 10.930
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[petrochenkov]

@bors retry

[bors]

⌛ Testing commit f756b07 with merge 1e01e22...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing 1e01e22 to master...