About unicode sequence support in groovy source code
Groovy supports some strange features on unicode:
1) Declaring identifier with unicode sequences , e.g. `def \u4e00\u9fa5 =
2) All source code is written in unicode sequence, e.g. `\u0064\u0065\u0066
\u0061 \u003d \u0031\u0032\u0033`, the corresponding readable code is `def a
They seems useless and impacts the performance of parsing, so I am
going to stop supporting it in 2.6.0+.