Suppress the complex expansion of expectations when we see effects in the lexical context. #1161
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… the lexical context. This PR changes the behaviour of the testing library for expressions such as: ```swift try #expect(a == b) ``` Currently, we don't expand that expression correctly because we can't tell where the `try` keyword should be applied. It sometimes expands and sometimes doesn't. This PR detects the presence of those keywords (with a recent-enough toolchain) and, if found, disables the fancy expansion in favour of a simpler one that is less likely to fail to compile. More thorough support for effectful expressions in expectations is tracked by #840 which involves fully refactoring the implementation of the `#expect()` macro.
grynspan
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briancroom,
stmontgomery and
suzannaratcliff
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suzannaratcliff
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Jun 18, 2025
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This PR changes the behaviour of the testing library for expressions such as:
Currently, we don't expand that expression correctly because we can't tell where the
trykeyword should be applied. It sometimes expands and sometimes doesn't. This PR detects the presence of those keywords (with a recent-enough toolchain) and, if found, disables the fancy expansion in favour of a simpler one that is less likely to fail to compile.More thorough support for effectful expressions in expectations is tracked by #840 which involves fully refactoring the implementation of the
#expect()macro. See also #162 for some more context.Checklist: