dotnet/roslyn
Unclear error message for pointer types in pattern matching
オープン
#43,339 opened on 2020/04/14
Area-CompilersConcept-Diagnostic ClarityFeature - Pattern Matchinghelp wanted
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説明
unsafe class C
{
static void Main()
{
int* ptr = null;
_ = ptr is var (x); // error CS8521: Pattern-matching is not permitted for pointer types.
_ = ptr is var y; // valid code
}
}
The error message shown above doesn't mention anything about parenthesized patterns, despite the fact that that's the only difference between those two lines. We can make this clearer.