Print why assert failed?

[ElegantBeef]

You can use `unittest.check` for a more descriptive message. 
    
    
    import std/unittest
    let
      a = 1
      b = 2
    check a == b
    
    
    Run

Outputs: 
    
    
    /usercode/in.nim(5, 8): Check failed: a == b
    a was 1
    b was 2
    
    
    Run