clang-format: Don't merge const and &, e.g. in function ref qualifiers.

Before (when aligning & to the right):
  SomeType MemberFunction(const Deleted &) const&;

After:
  SomeType MemberFunction(const Deleted &) const &;

This also applies to variable declarations, e.g.:
  int const * a;

However, this form is very uncommon (most people would write
"const int* a" instead) and contracting to "const*" might actually send
the wrong signal of what the const binds to.

llvm-svn: 272537

clang/lib/Format/TokenAnnotator.cpp

@@ -1993,7 +1993,7 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
     return false;
   if (Right.is(TT_PointerOrReference))
     return (Left.is(tok::r_paren) && Line.MightBeFunctionDecl) ||
-           (Left.Tok.isLiteral() ||
+           (Left.Tok.isLiteral() || Left.is(tok::kw_const) ||
             (!Left.isOneOf(TT_PointerOrReference, tok::l_paren) &&
              (Style.PointerAlignment != FormatStyle::PAS_Left ||
               Line.IsMultiVariableDeclStmt)));

clang/unittests/Format/FormatTest.cpp

@@ -5627,6 +5627,7 @@ TEST_F(FormatTest, UnderstandsFunctionRefQualification) {
   verifyFormat("SomeType MemberFunction(const Deleted &) && {}");
   verifyFormat("SomeType MemberFunction(const Deleted &) && final {}");
   verifyFormat("SomeType MemberFunction(const Deleted &) && override {}");
+  verifyFormat("SomeType MemberFunction(const Deleted &) const &;");
 
   FormatStyle AlignLeft = getLLVMStyle();
   AlignLeft.PointerAlignment = FormatStyle::PAS_Left;
@@ -5640,6 +5641,7 @@ TEST_F(FormatTest, UnderstandsFunctionRefQualification) {
   verifyFormat("auto Function(T... t) & -> void {}", AlignLeft);
   verifyFormat("auto Function(T) & -> void {}", AlignLeft);
   verifyFormat("auto Function(T) & -> void;", AlignLeft);
+  verifyFormat("SomeType MemberFunction(const Deleted&) const &;", AlignLeft);
 
   FormatStyle Spaces = getLLVMStyle();
   Spaces.SpacesInCStyleCastParentheses = true;