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T-Gro merged 1 commit into from
Dec 11, 2025
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Add new Fsharp optional warn: attribute invalid #50396

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1 change: 1 addition & 0 deletions docs/fsharp/language-reference/compiler-options.md
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Expand Up @@ -90,6 +90,7 @@ The F# compiler supports several opt-in warnings:
| 3570 | Ambiguous discard or shorthand | n/a | Warn when '_' is ambiguously used both as a discard and a function shorthand in the same scope. |
| 3579 | Untyped string interpolation | n/a | Warn when interpolated strings contain untyped values. Typed format specifiers are recommended. |
| 3582 | Function shadows union case | n/a | Warn when a function definition unintentionally shadows a union case. Use parentheses to disambiguate. |
| 3878 | Attribute invalid on union case with fields | n/a | Warn when an attribute is not valid for use on union cases with fields. |

You can enable these warnings by using `/warnon:NNNN` or `<WarnOn>NNNN</WarnOn>` where `NNNN` is the relevant warning number.
(You may also use the syntax `<WarnOn>FSNNNN</WarnOn>`, for example, `<WarnOn>FS3388</WarnOn>`.)
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