Exception in phase 'class generation'

@groovy.transform.CompileStatic
class Test {
    public static void main(String[] args) {
        def fieldMatcher = '[x=1] [a=b] [foo=bar]' =~ ~"\\[([^=\\[]+)=([^\\]]+)\\]"
        assert fieldMatcher
        def pairs = fieldMatcher.collect { it[1..2] }
    }
}