lost LineNumberTable in groovyc-produced bytecode

We observed that in come code produced by Groovy compiler there are missing line number attributes. Consider example:

~~~~~~~~~~~~~~~~~~
class DependencyManager {
Map artifactDescriptors = []
}
~~~~~~~~~~~~~~~~~~

In generated .class-file LineNumbertable attribute for initial code of DependencyManager class is absent. In same time if we use class initializer:
~~~~~~~~~~~~~~~~~~
class DependencyManager {

}
~~~~~~~~~~~~~~~~~~
we will see correct line number table:

LineNumberTable:
line 2: 108
line 3: 108

This annoying discrepancy complicates debugger's work.