Exit for std::tie case when DS1 has multi child decl

Author: flovent

clang-tools-extra/clang-tidy/modernize/UseStructuredBindingCheck.cpp

@@ -110,6 +110,8 @@ AST_MATCHER_P2(Stmt, hasPreTwoVarDecl, ast_matchers::internal::Matcher<VarDecl>,
   const DeclStmt *DS1 = (!DS2->isSingleDecl() || ((I + 2) == C->body_rend())
                              ? nullptr
                              : dyn_cast<DeclStmt>(*(I + 2)));
+  if (DS1 && !DS1->isSingleDecl())
+    return false;
 
   if (matchTwoVarDecl(DS1, DS2, InnerMatcher1, InnerMatcher2, Finder,
                       Builder)) {

clang-tools-extra/test/clang-tidy/checkers/modernize/use-structured-binding.cpp

@@ -230,6 +230,10 @@ void stdTieNotWarnCases() {
   a = 4;
   std::tie(a, b) = getPair<int, int>(); // no warning
 
+  int c = 0, d = 0;
+  int e = 0;
+  std::tie(a, b) = getPair<int, int>(); // no warning
+
   int* pa = nullptr;
   int* pb = nullptr;
   MarkUsed(pa);