build.gradle file, task using << notation, intellij warns: "Cannot infer argument type"

Question

I'm new to groovy and gradle and was wondering whether someone knew why my scriplet wasn't working (edit actually it does work but the warning still appears). This section is taken out of the build.gradle script and intellij highlights this and complains that it: "Cannot infer argument types". any help would be nice :)

task hellofun << {
    [silly:'billy'].each { k, v ->
        println "$k=$v"
    }
}

EDIT: I have submitted a bug request informing Intellij of this problem

EDIT: apparently this is a known bug I'll update this once the bug is fixed

Answer 1

If you are willing to disable the Groovy > Assignment Issues > Incompatible type assignments inspection, the warning goes away.

Answer 2

In a highly dynamically typed language such as groovy where names and symbols are resolved in arbitrary ways It would be quite difficult to determine the validity of any statement ahead of time without running the program. even running the program would theoretically not divulge all possible permutations of input that may change the runtime validity of a statement.

I applaud intellij's attempt at this hard problem and can live with a few incorrect syntax warnings here and there.

Answer 3

Untill the IntelliJ bug is fixed, there is a workaround: use doFirst instead of <<.

task hellofun() {
  doFirst {
    [silly:'billy'].each { k, v ->
      println "$k=$v"
    }
  }
}

Thanks for submitting the bug :)