Implement constraints on pointer types as input to pattern-matching. #30968
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A pointer type can match a var pattern (e.g. `var x`), a discard pattern (e.g. `_`), and a constant pattern with the value null (e.g. `null`). No other pattern forms would permit an input of a pointer type. Fixes dotnet#30798
cston
approved these changes
Nov 5, 2018
agocke
approved these changes
Nov 14, 2018
| @@ -216,7 +216,8 @@ internal BoundExpression ConvertPatternExpression(TypeSymbol inputType, CSharpSy | |||
| // input value among many constant tests. | |||
| convertedExpression = operand; | |||
| } | |||
| else if (conversion.ConversionKind == ConversionKind.NoConversion && convertedExpression.Type?.IsErrorType() == true) | |||
| else if (conversion.ConversionKind == ConversionKind.NullToPointer || | |||
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Might want to add some parenthesis here to make order of operations clear.
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A pointer type can match a var pattern (e.g.
var x), a discard pattern (e.g._), and a constant pattern with the value null (e.g.null). No other pattern forms would permit an input of a pointer type.Fixes #30798