rustdoc type-based search appears to not support searching by built-in types

[nagisa]

You can search for functions that appear to satisfy some sort of a shape/type as such input -> output, however that will not work for more complicated searches involving built-in types, including:

• slices [T] -> *;
• pointers *mut T -> *;
• tuples (*, *);
  • and similarly multiple arguments
• probably more.

Instead of attempting to guess a what kind of search this is based on -> I propose that we add another "type" indicating that this is a signature we’re looking for and take a type of the function pointer as an argument, so something like this would work:

• sig:fn([T]) -> *
• sig:fn(*mut T) -> T
• `sig:(A, B)
• sig:...

[GuillaumeGomez]

Ah no, I didn't support that at all.

[jyn514]

You can search for functions that appear to satisfy some sort of a shape/type as such input -> output, however that will not work for more complicated searches involving built-in types, including:

This doesn't seem to work currently ... https://doc.rust-lang.org/std/?search=OsString%20-%3E%20String doesn't give anything.

Related: rust-lang/docs.rs#494 (comment)

[GuillaumeGomez]

Very likely. I didn't enforce tests on this part and focused on the others so it's likely that it's broken.