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4d2f7b0c0d
This makes it so
```fish
if -e foo
# do something
end
```
complains about `-e` not being a command instead of `end` being used
outside of an if-block.
That means both that `-e` could now be used as a command name (it
already can outside of `if`!) *and* that we get a better error!
The only way to get `if` to be a decorated statement now is to use `if
-h` or `if --help` specifically (with a literal option).
The same goes for switch, while and begin.
It would be possible, alternatively, to disallow `if -e` and point
towards using `test` instead, but the "unknown command" message should
already point towards using `test` more than pointing at the
"end" (that might be quite far away).