owenca wrote:
You can annotate the lambda l_paren:
```
$ git diff FormatToken.h
diff --git a/clang/lib/Format/FormatToken.h b/clang/lib/Format/FormatToken.h
index cc45d5a8c5c1..abcedb66b57c 100644
--- a/clang/lib/Format/FormatToken.h
+++ b/clang/lib/Format/FormatToken.h
@@ -102,6 +102,7 @@ namespace format {
TYPE(JsTypeColon)
\
TYPE(JsTypeOperator)
\
TYPE(JsTypeOptionalQuestion)
\
+ TYPE(LambdaDefinitionLParen)
\
TYPE(LambdaLBrace)
\
TYPE(LambdaLSquare)
\
TYPE(LeadingJavaAnnotation)
\
$ git diff TokenAnnotator.cpp
diff --git a/clang/lib/Format/TokenAnnotator.cpp
b/clang/lib/Format/TokenAnnotator.cpp
index fe8a126e2547..fa1489402559 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -62,6 +62,7 @@ static bool canBeObjCSelectorComponent(const FormatToken
&Tok) {
/// With `Left` being '(', check if we're at either `[...](` or
/// `[...]<...>(`, where the [ opens a lambda capture list.
+// FIXME: this doesn't cover attributes/constraints before the l_paren.
static bool isLambdaParameterList(const FormatToken *Left) {
// Skip <...> if present.
if (Left->Previous && Left->Previous->is(tok::greater) &&
@@ -365,6 +366,7 @@ private:
Contexts.back().IsExpression = false;
} else if (isLambdaParameterList(&OpeningParen)) {
// This is a parameter list of a lambda expression.
+ OpeningParen.setType(TT_LambdaDefinitionLParen);
Contexts.back().IsExpression = false;
} else if (OpeningParen.is(TT_RequiresExpressionLParen)) {
Contexts.back().IsExpression = false;
$
```
https://github.com/llvm/llvm-project/pull/93140
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