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[experiment] Use unhygienic token matching for identifying macro variables #69410

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All other comparisons in macro_rules use "stupid" token matching instead of name resolution.

macro m(a $a: ident) {
    $a /* <- NEW!: matches "$a" from the macro LHS regardless of hygienic contexts */
}

m!(a /* <- OLD: matches "a" from the macro LHS regardless of hygienic contexts */ b)

r? @ghost

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@bors try

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bors commented Feb 23, 2020

⌛ Trying commit 739bcfe with merge e6563ac70cbfd3196492061900e9e9793e065e4d...

@petrochenkov petrochenkov added the S-waiting-on-crater Status: Waiting on a crater run to be completed. label Feb 23, 2020
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Inspired by #68746.

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bors commented Feb 24, 2020

☀️ Try build successful - checks-azure
Build commit: e6563ac70cbfd3196492061900e9e9793e065e4d (e6563ac70cbfd3196492061900e9e9793e065e4d)

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@craterbot check

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👌 Experiment pr-69410 created and queued.
🤖 Automatically detected try build e6563ac70cbfd3196492061900e9e9793e065e4d
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

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🚧 Experiment pr-69410 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

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🎉 Experiment pr-69410 is completed!
📊 3 regressed and 0 fixed (90999 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

@craterbot craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Feb 26, 2020
@petrochenkov petrochenkov added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 27, 2020
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Regressions:

  • rbalicki2.rustactoe.78e20cb04be08e6b7e56a72f3f6fe0f14a18dda4 - I couldn't reproduce this one.
  • defmac-0.2.1 - the macro intentionally uses macro variables with same name and different contexts.
  • ndarray-0.13.0 - depends on defmac-0.2.1 in --test mode.

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