================
@@ -4842,7 +4842,7 @@ bool TokenAnnotator::spaceRequiredBefore(const 
AnnotatedLine &Line,
     return true;
   }
   if (Left.is(TT_UnaryOperator)) {
-    if (Right.isNot(tok::l_paren)) {
+    if (!Right.isOneOf(tok::r_paren, tok::l_paren, tok::exclaim)) {
----------------
zygoloid wrote:

For `not!`, I think adding a space is the right choice for a C++ code 
formatter: `not !b` should probably be formatted with a space, not as `not!b`, 
even though it's a pretty strange thing to write.

I wonder if this should instead be:
```suggestion
    if (!Right.isOneOf(tok::r_paren, tok::l_paren, tok::comma)) {
```
... with the `)` and `,` cases firing only in places where we can locally tell 
this isn't actually a `not` operator at all.

https://github.com/llvm/llvm-project/pull/78176
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