[clang-format] Treat f<N | M>(a) as template function call (#124438)

Fixes #123144.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -252,10 +252,10 @@ class AnnotatingParser {
       // parameters.
       // FIXME: This is getting out of hand, write a decent parser.
       if (MaybeAngles && InExpr && !Line.startsWith(tok::kw_template) &&
-          Prev.is(TT_BinaryOperator)) {
-        const auto Precedence = Prev.getPrecedence();
-        if (Precedence > prec::Conditional && Precedence < prec::Relational)
-          MaybeAngles = false;
+          Prev.is(TT_BinaryOperator) &&
+          (Prev.isOneOf(tok::pipepipe, tok::ampamp) ||
+           Prev.getPrecedence() == prec::Equality)) {
+        MaybeAngles = false;
       }
       if (Prev.isOneOf(tok::question, tok::colon) && !Style.isProto())
         SeenTernaryOperator = true;

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -692,7 +692,7 @@ TEST_F(TokenAnnotatorTest, UnderstandsNonTemplateAngleBrackets) {
   EXPECT_TOKEN(Tokens[4], tok::less, TT_BinaryOperator);
   EXPECT_TOKEN(Tokens[8], tok::greater, TT_BinaryOperator);
 
-  Tokens = annotate("return A < B ^ A > B;");
+  Tokens = annotate("return A < B != A > B;");
   ASSERT_EQ(Tokens.size(), 10u) << Tokens;
   EXPECT_TOKEN(Tokens[2], tok::less, TT_BinaryOperator);
   EXPECT_TOKEN(Tokens[6], tok::greater, TT_BinaryOperator);
@@ -3678,6 +3678,11 @@ TEST_F(TokenAnnotatorTest, TemplateInstantiation) {
   EXPECT_TOKEN(Tokens[2], tok::less, TT_TemplateOpener);
   EXPECT_TOKEN(Tokens[6], tok::greater, TT_TemplateCloser);
 
+  Tokens = annotate("return FixedInt<N | M>(foo);");
+  ASSERT_EQ(Tokens.size(), 12u) << Tokens;
+  EXPECT_TOKEN(Tokens[2], tok::less, TT_TemplateOpener);
+  EXPECT_TOKEN(Tokens[6], tok::greater, TT_TemplateCloser);
+
   Tokens = annotate("return std::conditional_t<T::value == U::value, T, U>{};");
   ASSERT_EQ(Tokens.size(), 21u) << Tokens;
   EXPECT_TOKEN(Tokens[4], tok::less, TT_TemplateOpener);