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Make "default" a literal and other tweaks from recent LDM #18213
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@@ -3063,6 +3063,15 @@ private BoundExpression BindAsOperator(BinaryExpressionSyntax node, DiagnosticBa | |
return new BoundAsOperator(node, operand, typeExpression, Conversion.DefaultOrNullLiteral, resultType); | ||
} | ||
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if (operand.IsLiteralDefault()) | ||
{ | ||
var defaultLiteral = (BoundDefaultLiteral)operand; | ||
Debug.Assert((object)defaultLiteral.Type == null && (object)defaultLiteral.ConstantValueOpt == null); | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Consider splitting into two asserts. |
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operand = new BoundDefaultLiteral(defaultLiteral.Syntax, constantValueOpt: ConstantValue.Null, | ||
type: GetSpecialType(SpecialType.System_Object, diagnostics, node)); | ||
} | ||
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if (operand.Kind == BoundKind.MethodGroup) | ||
{ | ||
Error(diagnostics, ErrorCode.ERR_NoExplicitBuiltinConv, node, MessageID.IDS_MethodGroup.Localize(), targetType); | ||
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@@ -16,7 +16,7 @@ public static bool IsLiteralNull(this BoundExpression node) | |
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public static bool IsLiteralDefault(this BoundExpression node) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Perhaps There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. The reason I used this seemingly strange name is because it matches |
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{ | ||
return node.Kind == BoundKind.DefaultLiteral && (object)node.Type == null; | ||
return node.Kind == BoundKind.DefaultLiteral && node.Syntax.Kind() == SyntaxKind.DefaultLiteralExpression; | ||
} | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Why is the second condition needed? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more.
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// returns true when expression has no side-effects and produces | ||
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@@ -1475,5 +1475,6 @@ internal enum ErrorCode | |
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ERR_BadDynamicMethodArgDefault = 9000, | ||
ERR_DefaultNotValid = 9001, | ||
ERR_ExpressionTreeContainsDefaultLiteral = 9002, | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Should the previous two values be renamed to use the term |
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} | ||
} |
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@@ -700,5 +700,14 @@ public override BoundNode VisitThrowExpression(BoundThrowExpression node) | |
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return base.VisitThrowExpression(node); | ||
} | ||
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public override BoundNode VisitDefaultLiteral(BoundDefaultLiteral node) | ||
{ | ||
if (_inExpressionLambda && node.IsLiteralDefault()) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Related to earlier question: When will There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Why is |
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{ | ||
Error(ErrorCode.ERR_ExpressionTreeContainsDefaultLiteral, node); | ||
} | ||
return base.VisitDefaultLiteral(node); | ||
} | ||
} | ||
} |
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I would keep this method.