Suggest struct pattern when destructuring Range with .. syntax #149952
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r? @Alexendoo |
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I'm not part of the compiler team so I'll pass it back over to r? @lcnr |
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implemented a new diagnostic in rustc_resolve to detect invalid range destructuring attempts (e.g., let start..end = range). The fix identifies when resolution fails for identifiers acting as range bounds specifically handling cases where bounds are parsed as expressions and suggests the correct struct pattern syntax (std::ops::Range { start, end }). This replaces confusing "cannot find value" errors with actionable help, verified by a new UI test covering various identifier names.
Fixes #149777