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extern crate proc_macro;

use quote::quote;
use proc_macro2::{TokenTree, TokenStream};

#[proc_macro]
pub fn why(tokens: proc_macro::TokenStream) -> proc_macro::TokenStream {
    use quote::ToTokens;
    let a = quote! { 1 + 2 };
    // delimit a to maintain correct precedence behaviour

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$ cargo build
   Compiling normal_macro v0.1.0 (C:\Users\Maurits\Projects\macro_bug\normal_macro)
error[E0425]: cannot find value `a` in this scope
  --> src\main.rs:5:43
   |
5  |     ($test:expr) => {proc_macro::forward!($test)}
   |                                           ^^^^^ not found in this scope
...
12 |     println!("{}", forward!(a));
   |                    ----------- in this macro invocation

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const float EPSILON = 0.01;
const float MAX_DISTANCE = 100.;
const float SCREEN_DISTANCE = 2.;
const int MAX_ITER = 100;

// why o why does webGL not support inverse(mat3);
mat3 inv(mat3 m) {
  float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2];
  float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2];
  float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2];

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; excerpt from loop_notrash as it got inlined in here
loc_140001050:
    xor     esi, esi
    xor     eax, eax

loc_140001054:
    mov     rcx, rax
    lea     rax, [rcx+rsi*2-2]
    mov     rdx, rsi
    nop

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$ cargo bench
    Finished release [optimized] target(s) in 0.0 secs
     Running target\release\deps\benching-22b624a5099107eb.exe

running 2 tests
test tests::loop_notrash ... bench:   1,053,106 ns/iter (+/- 162,958)
test tests::loop_trash   ... bench:   1,458,335 ns/iter (+/- 149,239)

test result: ok. 0 passed; 0 failed; 0 ignored; 2 measured