Remove Extra String Concat Token

[jdconrad]

Renamed no-semicolon tests to work when running gradle. Also removed the ..= token entirely from the grammar as string concatenation now uses the overloaded += operator.

[rjernst]

LGTM

[nik9000]

You might not have meant to indent that.

[nik9000]

Wait, antlr did that. How did it do that? Oh well, doesn't matter.

[jdconrad]

It's auto-generated based on the Lexer file.

[jdconrad]

It's a personal preference of mine to have the Lexer file look like this --

@header {
    import java.util.Set;
}

Instead it can be changed to look like this --

@header {
import java.util.Set;
}

However, I felt that it was more important to make the created content readable over the auto-generated content.

[nik9000]

Ah! That makes sense. Its cool.

[nik9000]

We are going to have to figure out a way to make checkstyle ignore these.... Eventually!

[jasontedor]

You can <suppress checks="." files="org/elasticsearch/painless/PainlessLexer.java"/> or whatever pattern we need on the end to get any other auto-generated files (something like that, going off-the-cuff here).

[nik9000]

LGTM too