[GROOVY-8138] Compile static to support streams

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.10
• Fix Version/s: 2.6.0-alpha-3, 3.0.0-alpha-2, 2.5.0-rc-2
• Component/s: Static compilation
• Environment: Windows 7, JDK 1.8.0_66
• Assignee: Daniel Sun
• Reporter: Iurii
• Created: 29/Mar/17 15:25
• Updated: 26/Jul/18 04:38
• Resolved: 07/May/18 01:12

Description

The following code

import groovy.transform.CompileStatic

import static java.util.stream.Collectors.toList

@CompileStatic
class Test {
    static void main(String[] args) {
        List<String> tables = ['a', 'b']
        println tables.stream().filter { tableName -> tableName.contains('a') }.collect(toList())
    }
}

fails with the error:
Error:(9, 55) Groovyc: [Static type checking] - Cannot find matching method java.lang.Object#contains(java.lang.String). Please check if the declared type is right and if the method exists.

But works fine with compile dynamic.
It would be great if CompileStatic get all required types from the steam (type info should be there, Java can handle similar code)