fix: Use per-token, not global, edition in the parser #20163
+55
−61
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This turns out to not mitigate #20153, because it was not the real reason. The real reason even has a FIXME:
rust-analyzer/crates/mbe/src/lib.rs
Lines 372 to 373 in 8b53dd0
But it still should fix some small bug that only appears on edition 2015. I didn't write a test because I'm not sure under what conditions it'll manifest, but it should be there.