Merge pull request #62844 from DougGregor/sema-annotator-crash-62840

Author: DougGregor

lib/IDE/SourceEntityWalker.cpp

@@ -582,12 +582,14 @@ ASTWalker::PreWalkResult<Expr *> SemaAnnotator::walkToExprPre(Expr *E) {
     // The macro itself.
     auto macroRef = ME->getMacroRef();
     auto macroDecl = macroRef.getDecl();
-    auto macroRefType =
-        macroDecl->getInterfaceType().subst(macroRef.getSubstitutions());
-    if (!passReference(
-            macroDecl, macroRefType, ME->getMacroNameLoc(),
-            ReferenceMetaData(SemaReferenceKind::DeclRef, None)))
-      return Action::Stop();
+    if (macroDecl) {
+      auto macroRefType =
+          macroDecl->getInterfaceType().subst(macroRef.getSubstitutions());
+      if (!passReference(
+              macroDecl, macroRefType, ME->getMacroNameLoc(),
+              ReferenceMetaData(SemaReferenceKind::DeclRef, None)))
+        return Action::Stop();
+    }
 
     // Walk the arguments, since they were written directly by the user.
     if (auto argList = ME->getArgs()) {

test/SourceKit/CursorInfo/crash-62840.swift

@@ -0,0 +1,3 @@
+#if true
+// RUN: %sourcekitd-test -req=cursor -pos=%(line + 1):7 %s -- %s
+#endifsomeGesture