ILSpy

.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

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Siegfried Pammer f9d30c5574 Emit var and natural-typed lambdas for anonymous delegate types Method groups and lambdas whose shape Action/Func cannot express (ref parameter or return kinds, and with pointers, params, or default values the non-generic fallback) get compiler-synthesized delegate types: <>A{flags} (void-returning), <>F{flags} (value-returning), and <>f__AnonymousDelegateN. Their names are unspeakable, so declared variables printed the escaped type name and did not compile. Detect them (generated name in one of the three families, delegate kind, CompilerGenerated, no namespace), declare locals of such types as 'var', hide the synthesized type definitions, name the locals 'anon', and let DelegateConstruction accept the synthesized methods. Since the site is then typed solely by the anonymous function's natural type, lambda syntax is mandatory: 'delegate {}' without a parameter list has no natural type, and the 'delegate' form cannot declare a return type. When the return type C# would re-infer from the emitted body differs from the delegate's (a widened return, or a discarded value in an expression body), the lambda declares the delegate's return type explicitly (C# 10). The LambdaReturnTypes fixture pins that last part: in a delegate-typed context an explicit return type leaves no trace in metadata, so the syntax only matters for natural-typed lambdas. Every case has a ref parameter, which makes 'var' the only legal declaration, and the return type appears exactly where it is load-bearing - widening the body's type to object, or forcing void over an inferable int - and is omitted where inference recovers it. Gated by a new NaturalTypeForLambdaAndMethodGroup setting (C# 10). Assisted-by: Claude:claude-fable-5:Claude Code		1 month ago
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ControlFlow	Fix #1638 : identify renamed yield state machine members via method impls	2 months ago
Instructions	Support deconstruction into pointer targets	1 month ago
Patterns	Add license headers to source files that lacked them	2 months ago
Transforms	Emit var and natural-typed lambdas for anonymous delegate types	1 month ago
BlockBuilder.cs	dev: Strip BOM mark from text files	1 year ago
ILAmbience.cs	Replace AST null-objects with nullable reference types	3 months ago
ILAstWritingOptions.cs	dev: Strip BOM mark from text files	1 year ago
ILInstructionExtensions.cs	Add license headers to source files that lacked them	2 months ago
ILReader.cs	Fix #3729 : recognize value-type ctor call on unresolved type	1 month ago
ILTypeExtensions.cs	Improve inlining of boxed values	10 months ago
ILVariable.cs	dev: Strip BOM mark from text files	1 year ago
InstructionFlags.cs	dev: Strip BOM mark from text files	1 year ago
InstructionOutputExtensions.cs	dev: Strip BOM mark from text files	1 year ago
Instructions.cs	Bracket ILAst WriteTo in one place via WriteToCore	3 months ago
Instructions.tt	Bracket ILAst WriteTo in one place via WriteToCore	3 months ago
PointerArithmeticOffset.cs	Fix IDE2000 globally	9 months ago
PrimitiveType.cs	dev: Strip BOM mark from text files	1 year ago
SemanticHelper.cs	…
SlotInfo.cs	dev: Strip BOM mark from text files	1 year ago
StackType.cs	dev: Strip BOM mark from text files	1 year ago