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67faa107b0
These printed "Unknown error while evaluating command substitution".
Now they print something like
```
fish: for: status: cannot overwrite read-only variable
for status in foo; end
^~~~~^
in command substitution
fish: Invalid arguments
echo (for status in foo; end)
^~~~~~~~~~~~~~~~~~~~~~~^
```
for `echo (for status in foo; end)`
This is, of course, still not *great*. Mostly the `fish: Invalid
arguments` is basically entirely redundant.
An alternative is to simply skip the error message, but that requires some
more scaffolding (describe_with_prefix adds some error messages on its
own, so we can't simply say "don't add the prefix if we don't have a
message")
(cherry picked from commit
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| .. | ||
| checks | ||
| pexpects | ||
| test_functions | ||
| .gitignore | ||
| history_sample_bash | ||
| history_sample_corrupt1 | ||
| history_sample_fish_1_x | ||
| history_sample_fish_2_0 | ||
| interactive.config | ||
| interactive.fish | ||
| test.fish | ||
| test_driver.sh | ||
| test_env.sh | ||
| test_util.fish | ||