================
@@ -620,11 +645,34 @@ Sema::ComputeExpansionSize(CXXExpansionStmtPattern
*Expansion) {
EnterExpressionEvaluationContext ExprEvalCtx(
*this, ExpressionEvaluationContext::ConstantEvaluated);
- // TODO: Build the lambda and evaluate it.
- Diag(Loc, diag::err_iterating_expansion_stmt_unsupported);
- return std::nullopt;
+ // Annotation token that instructs the parser to declare begin/end.
+ Token DeclareBeginEnd;
+ DeclareBeginEnd.startToken();
+ DeclareBeginEnd.setKind(tok::annot_expansion_stmt_declare_begin_end);
+ DeclareBeginEnd.setAnnotationValue(Expansion->getRangeVar());
+ DeclareBeginEnd.setLocation(Loc);
+ DeclareBeginEnd.setAnnotationEndLoc(Loc);
+
+ // Build the lambda.
+ ExprResult Call = TokenInjectionHandler->ParseAsExpression(
+ R"c++(
+ [&] consteval {
+ __PTRDIFF_TYPE__ __result = 0;
+ // Note: The next line is equivalent to:
+ // auto __begin = begin-expr;
+ // auto __end = end-expr;
----------------
cor3ntin wrote:
I don't think that comment here is helping anyone - maybe move it outside of
the injected code
https://github.com/llvm/llvm-project/pull/208877
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