Consider the following script:
execute 'if 0'
echo 'Not shown'
else
echo 'Shown'
endif
. If you source it you find that instead of 3 errors (“missing :endif”, “:else
without :if”, “:endif without :if”) and two messages (“Not shown” and “Shown”)
you will see one message (“Shown”) and no errors.
Note that `execute 'if 0'` is explicitly forbidden in help:
> Note: The executed string may be any command-line, but
> you cannot start or end a "while", "for" or "if"
> command. Thus this is illegal:
> :execute 'while i > 5'
> :execute 'echo "test" | break'
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