...implementation instead of using it as a template name, and I'm still getting no...

...the templates, not in the structure. Maybe `
template functionTypeOf(alias func)`

For example:

```d
auto...

...en.cppreference.com/w/cpp/language/class_template_argument_deduction#:~:text=x%7B2.0%2C...

...is `synchronized` or not, so you can't do a safe template function for this.

...also done to reduce the number of template instantiations.
And I agree, it should be...

...wondering if the GCAllocator should accept a template flag that dictates the NO_SCAN requirement...

...I said, I understand it will ruin template type deduction as well as function overloading...

...compile:
```
// Error: none of the overloads of template `object.require` are callable using argument types...

...it solves this.

The problem happens in template code:

void main() {
  const i = 42;  // const...

...dmd/std/range/package.d(3767): Error: template instance
`std.range.primitives.isInputRange!(Generator!(function...