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unison/unison-src/transcripts/todo-bug-builtins.output.md
Greg Pfeil 0031542faf
Add a space before code block info strings 
This is for consistency with the `cmark` style. Now the blocks we still
pretty-print ourselves will match the bulk of them that `cmark`
produces.
2024-07-10 13:56:07 -06:00

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The todo and bug builtin

todo and bug have type a -> b. They take a message or a value of type a and crash during runtime displaying a in ucm.

> todo "implement me later"


  Loading changes detected in scratch.u.

  ✅
  
  scratch.u changed.
  
  Now evaluating any watch expressions (lines starting with
  `>`)... Ctrl+C cancels.

  💔💥
  
  I've encountered a call to builtin.todo with the following
  value:
  
    "implement me later"
  
  Stack trace:
    todo
    #qe5e1lcfn8


> bug "there's a bug in my code"


  Loading changes detected in scratch.u.

  ✅
  
  scratch.u changed.
  
  Now evaluating any watch expressions (lines starting with
  `>`)... Ctrl+C cancels.

  💔💥
  
  I've encountered a call to builtin.bug with the following
  value:
  
    "there's a bug in my code"
  
  Stack trace:
    bug
    #m67hcdcoda

Todo

todo is useful if you want to come back to a piece of code later but you want your project to compile.

complicatedMathStuff x = todo "Come back and to something with x here"


  Loading changes detected in scratch.u.

  I found and typechecked these definitions in scratch.u. If you
  do an `add` or `update`, here's how your codebase would
  change:
  
    ⍟ These new definitions are ok to `add`:
    
      complicatedMathStuff : x -> r

Bug

bug is used to indicate that a particular branch is not expected to execute.

test = match true with
    true -> "Yay"
    false -> bug "Wow, that's unexpected"


  Loading changes detected in scratch.u.

  I found and typechecked these definitions in scratch.u. If you
  do an `add` or `update`, here's how your codebase would
  change:
  
    ⍟ These new definitions are ok to `add`:
    
      test : Text