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Branch: fix/lambda-parameter-syntax

Commit Graph

Author	SHA1	Message	Date
Siegfried Pammer	3cc49044ec	Extend UseLambdaSyntax to emit statement lambdas Under UseLambdaSyntax, anonymous functions became lambdas only when an expression body was possible; statement-bodied ones kept C# 2 delegate syntax. Now every anonymous function whose parameter shape a lambda can express uses lambda syntax; delegate syntax remains for ref/out/in and params parameters and for pre-C# 3 language profiles. Two latent issues surfaced by the wider lambda coverage: DeclareVariables assumed an insertion point directly under a LambdaExpression is an expression body it must convert to a block, which block-bodied lambdas now violate; and anonymous methods declared without a parameter list carry compiler-generated parameter names like '<p0>' that are not valid identifiers, so the lambda's mandatory parameter list regenerates such names from the parameter type: (object obj, EventArgs e) => ... A side effect visible in fixtures: an explicit parameter list can make a delegate-creation cast redundant that bare 'delegate' syntax needed for overload resolution, e.g. new Thread((ThreadStart)delegate { }) becomes new Thread(() => { }). Assisted-by: Claude:claude-fable-5:Claude Code	1 month ago
Peter Crabtree	e1e16b64f5	dev: Strip BOM mark from text files	1 year ago
Siegfried Pammer	659b12bdb8	Fix #1083 : add pattern for mcs auto events (version 4)	9 years ago

Author

SHA1

Message

Date

Siegfried Pammer

3cc49044ec

Extend UseLambdaSyntax to emit statement lambdas

Under UseLambdaSyntax, anonymous functions became lambdas only when an
expression body was possible; statement-bodied ones kept C# 2 delegate
syntax. Now every anonymous function whose parameter shape a lambda can
express uses lambda syntax; delegate syntax remains for ref/out/in and
params parameters and for pre-C# 3 language profiles.

Two latent issues surfaced by the wider lambda coverage: DeclareVariables
assumed an insertion point directly under a LambdaExpression is an
expression body it must convert to a block, which block-bodied lambdas
now violate; and anonymous methods declared without a parameter list
carry compiler-generated parameter names like '<p0>' that are not valid
identifiers, so the lambda's mandatory parameter list regenerates such
names from the parameter type: (object obj, EventArgs e) => ...
A side effect visible in fixtures: an explicit parameter list can make
a delegate-creation cast redundant that bare 'delegate' syntax needed
for overload resolution, e.g. new Thread((ThreadStart)delegate { })
becomes new Thread(() => { }).

Assisted-by: Claude:claude-fable-5:Claude Code

1 month ago

Peter Crabtree

e1e16b64f5

dev: Strip BOM mark from text files

1 year ago

Siegfried Pammer

659b12bdb8

Fix #1083 : add pattern for mcs auto events (version 4)

9 years ago

3 Commits (fix/lambda-parameter-syntax)