Differentiate provided generic types on name collision

[Nikolai Vazquez]

The following code:

struct String;

#[divan::bench(types = [String, std::string::String])]
fn bench<T>() {}

...produces this output tree structure:

example
╰─ bench
   ├─ String
   ╰─ String

This makes it very difficult to differentiate which String is being referred to. It's not impossible because the sorting is based on input order if names collide.

[Oliver Killane]

This is also quite frustrating when unqualified names are the same and constants are used.

use divan::{Bencher, black_box};

fn main() { divan::main(); }

mod A { pub struct Foo; }
mod B { pub struct Foo; }

#[divan::bench(types = [A::Foo, B::Foo], consts = [1,2])]
fn foos<T, const N: usize>(bencher: Bencher) {
    bencher.bench(|| () );
}

Results in:

Timer precision: 15 ns
example     fastest       │ slowest       │ median        │ mean          │ samples │ iters
╰─ foos                   │               │               │               │         │
   ╰─ Foo                 │               │               │               │         │
      ├─ 1  0.112 ns      │ 0.265 ns      │ 0.114 ns      │ 0.117 ns      │ 100     │ 819200
      ├─ 1  0.112 ns      │ 0.126 ns      │ 0.113 ns      │ 0.115 ns      │ 100     │ 819200
      ├─ 2  0.112 ns      │ 0.114 ns      │ 0.113 ns      │ 0.113 ns      │ 100     │ 819200
      ╰─ 2  0.107 ns      │ 0.262 ns      │ 0.113 ns      │ 0.116 ns      │ 100     │ 819200

When really it should disambiguate as:

Timer precision: 15 ns
example     fastest       │ slowest       │ median        │ mean          │ samples │ iters
╰─ foos                   │               │               │               │         │
   ├─ A::Foo              │               │               │               │         │
   │  ├─ 1  0.126 ns      │ 0.134 ns      │ 0.127 ns      │ 0.128 ns      │ 100     │ 819200
   │  ╰─ 2  0.121 ns      │ 0.129 ns      │ 0.121 ns      │ 0.122 ns      │ 100     │ 819200
   ╰─ B::Foo              │               │               │               │         │
      ├─ 1  0.121 ns      │ 0.826 ns      │ 0.121 ns      │ 0.134 ns      │ 100     │ 819200
      ╰─ 2  0.121 ns      │ 0.124 ns      │ 0.121 ns      │ 0.121 ns      │ 100     │ 819200