[GROOVY-6240] static type checker cannot infer type of for loop variable from map

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.1.5
• Fix Version/s: 2.4.3
• Component/s: Static compilation, Static Type Checker
• Assignee: Cédric Champeau
• Reporter: Rob Fletcher
• Created: 08/Jul/13 04:59
• Updated: 31/Mar/15 06:08
• Resolved: 20/Mar/15 09:54

Description

The following code fails type checking as the inferred type of the entry loop variable is Object.

@groovy.transform.CompileStatic
class Looper {
    static void main(String... args) {
        Map<String, Integer> map = [foo: 123, bar: 456]
        for (entry in map) {
            println entry.key.reverse()
            println entry.value * 2
        }
    }
}

If I change it to for (entry in map.entrySet()) it works fine.

Issue Links

• duplicates: GROOVY-6123 Cannot use @CompileStatic with loop over Enumeration