Debug assertion failure in MethodSymbol.AsMember when called from Binder.UnwrapCollectionExpressionIfNullable #73181

sharwell · 2024-04-22T20:27:15Z

MethodSymbol.AsMember assumes that the newOwner is not an error symbol. This can fail (cause a debug assertion) for the following caller:

Line 711 in 3f00cca

    
           nullableValueGetter = nullableValueGetter.AsMember((NamedTypeSymbol)collectionExprType);

It seems like it should be sufficient to modify the following condition to also not take any action when collectionExprType is an error type:

Line 704 in 3f00cca

if ((object)collectionExprType != null && collectionExprType.IsNullableType())

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