[GROOVY-9901] Memoization doesn't seem to work for trait methods

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.12
• Fix Version/s: 4.0.0-alpha-3
• Component/s: ast builder
• Assignee: Eric Milles
• Reporter: Lőrinc Pap
• Created: 19/Jan/21 11:02
• Updated: 02/May/21 09:18
• Resolved: 02/Mar/21 15:15

Description

I wanted to memorize a method in a trait, basically the following:

import groovy.transform.Memoized

trait T {
    @Memoized
    double method() {
        Math.random()
    }
}

class A implements T {}
class B implements T {}

def a = new A()
println a.method()
println a.method()
println new A().method()
println new B().method()

And was surprised to see that they all returned different results.

If this isn't supported, could we at least warn in case of AST transformations being applied to traits (i.e. http://docs.groovy-lang.org/next/html/documentation/core-traits.html#_compatibility_with_ast_transformations)?