1 files changed, 4 insertions, 0 deletions
diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
index 32dacbcc964..df8388926db 100644
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -756,6 +756,7 @@ class CastExpressionIdValidator final : public CorrectionCandidateCallback {
 /// [C++11] user-defined-literal
 ///         '(' expression ')'
 /// [C11]   generic-selection
+/// [C++2a] requires-expression
 ///         '__func__'        [C99 6.4.2.2]
 /// [GNU]   '__FUNCTION__'
 /// [MS]    '__FUNCDNAME__'
@@ -1601,6 +1602,9 @@ ExprResult Parser::ParseCastExpression(CastParseKind ParseKind,
       *NotPrimaryExpression = true;
     return ParseCXXDeleteExpression(false, Tok.getLocation());
 
+  case tok::kw_requires: // [C++2a] requires-expression
+    return ParseRequiresExpression();
+
   case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
     if (NotPrimaryExpression)
       *NotPrimaryExpression = true;