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Add regression test: #4473, extern function parameters not flagged as unused #19580

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Merged
T-Gro merged 2 commits into from
Apr 14, 2026
+16 −0
Merged

Add regression test: #4473, extern function parameters not flagged as unused #19580

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Add regression test: #4473, extern function parameters not flagged as…
github-actions[bot] Apr 14, 2026
d7f39ff
Merge branch 'main' into regression-test/issue4473-2b44a41f285c4ac5
T-Gro Apr 14, 2026
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16 changes: 16 additions & 0 deletions tests/FSharp.Compiler.ComponentTests/ErrorMessages/WarnExpressionTests.fs
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Expand Up @@ -277,3 +277,19 @@ let main _argv =
"""
|> typecheck
|> shouldSucceed

// https://github.com/dotnet/fsharp/issues/4473
[<Fact>]
let ``Issue 4473 - extern function parameters not flagged as unused with warnon 1182``() =
FSharp """
module Test4473

open System.Runtime.InteropServices

[<DllImport("kernel32.dll")>]
extern bool Beep(int frequency, int duration)
"""
|> withWarnOn 1182
|> asLibrary
|> typecheck
|> shouldSucceed
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