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18772b73b3
# Description
As per our Wednesday meeting, this adds a parse error when something
that would be parsed as an external call is present at the top level,
unless the head of the external call begins with a caret (to make it
explicit).
I tried to make the error quite descriptive about what should be done.
# User-Facing Changes
These now cause a parse error:
```nushell
$foo = bar
$foo = `bar`
```
These would have been interpreted as strings before this version, but
now they'd be interpreted as external calls. This behavior is consistent
with `let`/`mut` (which is unaffected by this change).
Here is an example of the error:
```
Error: × External command calls must be explicit in assignments
╭─[entry #3:1:8]
1 │ $foo = bar
· ─┬─
· ╰── add a caret (^) before the command name if you intended to run and capture its output
╰────
help: the parsing of assignments was changed in 0.97.0, and this would have previously been treated as a string.
Alternatively, quote the string with single or double quotes to avoid it being interpreted as a command name. This
restriction may be removed in a future release.
```
# Tests + Formatting
Tests added to cover the change. Note made about it being temporary.