Specialize FS0027 for function/method parameters#19866
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Tests pin the desired behavior: FS0027 emitted on a parameter must not suggest the illegal 'let mutable x = expression' shadow. Local-let behavior preserved as regression sentinel. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
When the assignment target is a parameter, emit a message that suggests a legal remediation ('let mutable x = x' shadow, or byref<_>) instead of the illegal 'let mutable x = expression'. Local 'let' bindings retain the original message.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
When the assignment target in FS0027 is a function or method parameter, the compiler now emits a parameter-specific error message suggesting legal remediations (\let mutable x = x\ shadow or \�yref<_>) instead of the illegal \let mutable x = expression\ suggestion.
Local \let\ bindings retain the original message.
Changes
Fixes #15803