6632beeca9
The expr/c syntax class, as well as its underlying implementation function, wrap-expr/c, previously produced misleading error messages. The main purpose of these tools is to ensure a user-provided expression conforms to a macro-provided contract. However, contract errors produced by these forms were consistent with situations where both value and contract were provided by the same party. This fixes the discrepancy by changing how these forms assign blame to emulate contract errors that arise from improper function arguments, since most expressions provided to macros are semantically similar to function arguments. All examples within the documentation itself reflect this use case. These changes alter the contents of error messages raised by expr/c and wrap-expr/c, which could theoretically break some test suites, but it’s extremely unlikely that any non-test code would depend on the precise wording of contract error messages, and the interface is otherwise completely backwards-compatible. fixes #1412 |
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