`@!` doesn't work on functions with return type in signature

[li1]

For example:

> @! function g() end
g (generic function with 1 method)

> g(
g(var"#context"::ResourceContexts.AbstractContext) in Main at REPL[10]:1

but

> @! function h()::Int end
h (generic function with 1 method)

> h(
h() in Main at REPL[11]:1

[c42f]

True. There's probably several issues of this form — where clauses, etc.