text.find doesn't find Nat literals in pattern match #6073
Description
Describe and demonstrate the bug
It seems to work on Nat literals that are in other places and on Text literals in pattern matches, but not on Nat literals on the left side of a pattern match.
``` ucm
> builtins.merge
Done.
```
``` unison
openSesame : Nat -> Text
openSesame = cases
230971246918247 -> "You guessed the password!"
_ -> "Try again."
```
``` ucm :added-by-ucm
Loading changes detected in scratch.u.
+ openSesame : Nat -> Text
Run `update` to apply these changes to your codebase.
```
``` ucm
> update
> text.find "230971246918247"
```
🛑
The transcript failed due to an error in the stanza above. The error is:
```
😶 I couldn't find any matches.
Tip: `text.find.all` will search `lib` as well.
```
Environment (please complete the following information):
ucm --version51ef936