InlayHint for operator()

[zyn0217]

We don't show parameter hints for a user-defined function call operator() nor a call to lambda, for example:

struct S {
  void operator()(int x, int y) const;
};

void foo() {
  auto lambda = [](auto x) {};
  S()(1, 2); // nothing here.
  lambda("abcd") // nothing here.
}

This seems to be intended, as per the comment from InlayHints.cpp:

// Do not show parameter hints for operator calls written using operator
// syntax or user-defined literals. (Among other reasons, the resulting
// hints can look awkard, e.g. the expression can itself be a function
// argument and then we'd get two hints side by side).

However, I think it'd be fine to be lenient on function call to operator(): They are formed in a normal function call syntax, and I didn't find a case where they are inappropriate.

Nathan, what do you think? @HighCommander4

[zyn0217]

https://reviews.llvm.org/D158926

[HighCommander4]

However, I think it'd be fine to be lenient on function call to operator(): They are formed in a normal function call syntax, and I didn't find a case where they are inappropriate.

Nathan, what do you think? @HighCommander4

+1, that seems like an oversight