Missed issues in editor

[jbonch]

A little bit strange, but the IDEA editor doesn't show any errors for the following code:

var b //must have assignment
func fun(){
    return //must return something
}

I have checked the same example in ANTLRv4 plugin and it shows 2 errors.

[jbonch]

It looks like it is related with https://github.com/antlr/antlr4-intellij-adaptor/issues/2. So probably it can be closed.