unison/unison-src/transcripts/fix2167.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

41 lines
1002 B
Markdown

This is just a simple transcript to regression check an ability
inference/checking issue.
``` unison
structural ability R t where
die : () -> x
near.impl : Nat -> Either () [Nat]
R.near n = match near.impl n with
Left e -> die ()
Right a -> a
R.near1 region loc = match R.near 42 with
[loc] -> loc
ls -> R.die ()
```
``` ucm
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`:
structural ability R t
R.near : Nat ->{R t} [Nat]
R.near1 : region -> loc ->{R t} Nat
```
The issue was that abilities with parameters like this were sometimes
causing failures like this because the variable in the parameter would
escape to a scope where it no longer made sense. Then solving would
fail because the type was invalid.
The fix was to avoid dropping certain existential variables out of
scope.