Use correct edition when parsing :pat matchers
#85709
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This was referenced May 26, 2021
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r=me with the typo (#85709 (comment)) fixed. |
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As described in issue rust-lang#85708, we currently do not properly decode `SyntaxContext::root()` and `ExpnId::root()` from foreign crates. As a result, when we decode a span from a foreign crate with `SyntaxContext::root()`, we end up up considering it to have the edition of the *current* crate, instead of the foreign crate where it was originally created. A full fix for this issue will be a fairly significant undertaking. Fortunately, it's possible to implement a partial fix, which gives us the correct edition-dependent behavior for `:pat` matchers when the macro is loaded from another crate. Since we have the edition of the macro's defining crate available, we can 'recover' from seeing a `SyntaxContext::root()` and use the edition of the macro's defining crate. Any solution to issue rust-lang#85708 must reproduce the behavior of this targeted fix - properly preserving a foreign `SyntaxContext::root()` means (among other things) preserving its edition, which by definition is the edition of the foreign crate itself. Therefore, this fix moves us closer to the correct overall solution, and does not expose any new incorrect behavior to macros.
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…petrochenkov Use correct edition when parsing `:pat` matchers As described in issue rust-lang#85708, we currently do not properly decode `SyntaxContext::root()` and `ExpnId::root()` from foreign crates. As a result, when we decode a span from a foreign crate with `SyntaxContext::root()`, we end up up considering it to have the edition of the *current* crate, instead of the foreign crate where it was originally created. A full fix for this issue will be a fairly significant undertaking. Fortunately, it's possible to implement a partial fix, which gives us the correct edition-dependent behavior for `:pat` matchers when the macro is loaded from another crate. Since we have the edition of the macro's defining crate available, we can 'recover' from seeing a `SyntaxContext::root()` and use the edition of the macro's defining crate. Any solution to issue rust-lang#85708 must reproduce the behavior of this targeted fix - properly preserving a foreign `SyntaxContext::root()` means (among other things) preserving its edition, which by definition is the edition of the foreign crate itself. Therefore, this fix moves us closer to the correct overall solution, and does not expose any new incorrect behavior to macros.
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…laumeGomez Rollup of 8 pull requests Successful merges: - rust-lang#85285 (Add eslint checks to CI) - rust-lang#85709 (Use correct edition when parsing `:pat` matchers) - rust-lang#85762 (Do not try to build LLVM with Zlib on Windows) - rust-lang#85770 (Remove `--print unversioned-files` from rustdoc ) - rust-lang#85781 (Add documentation for aarch64-apple-ios-sim target) - rust-lang#85801 (Add `String::extend_from_within`) - rust-lang#85817 (Fix a typo) - rust-lang#85818 (Don't drop `PResult` without handling the error) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Thank you for fixing this, @Aaron1011! |
This was referenced Jun 22, 2021
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As described in issue #85708, we currently do not properly decode
SyntaxContext::root()andExpnId::root()from foreign crates. As aresult, when we decode a span from a foreign crate with
SyntaxContext::root(), we end up up considering it to have the editionof the current crate, instead of the foreign crate where it was
originally created.
A full fix for this issue will be a fairly significant undertaking.
Fortunately, it's possible to implement a partial fix, which gives us
the correct edition-dependent behavior for
:patmatchers when themacro is loaded from another crate. Since we have the edition of the
macro's defining crate available, we can 'recover' from seeing a
SyntaxContext::root()and use the edition of the macro's definingcrate.
Any solution to issue #85708 must reproduce the behavior of this
targeted fix - properly preserving a foreign
SyntaxContext::root()means (among other things) preserving its edition, which by definition
is the edition of the foreign crate itself. Therefore, this fix moves us
closer to the correct overall solution, and does not expose any new
incorrect behavior to macros.