[ruby-core:93585] [Ruby master Bug#15990] "else if" causes confusing syntax error

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Issue #15990 has been updated by nobu (Nobuyoshi Nakada).


Warning only after a syntax error?

```
$ ./ruby -w 
if false
else if true
end
-:3: syntax error, unexpected end-of-input, expecting `end'
-:3: `end' of `if' matched `else' before `if'
-:2: maybe `elsif'?
```

----------------------------------------
Bug #15990: "else if" causes confusing syntax error
https://bugs.ruby-lang.org/issues/15990#change-79165

* Author: viko (Viko Viko)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
```
if false
  puts 'false'
else if true
  puts 'true'
end
```

This fails with "syntax error: unexpected end-of-input, expecting end". `else if` isn't `elsif`, of course, but if a file contains `else if` (especially on one line, though I don't know how easy that would be to track) and fails to parse, it is probably worth noting, especially since this kind of syntax error can't easily be traced back to a particular line.



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