[GROOVY-7618] Parameterless closure to SAM coercion causes NPE during instruction selection with STC

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.5
• Fix Version/s: 2.4.6
• Component/s: Static Type Checker
• Environment: Java 1.8.0_60, OSX 10.10
• Assignee: Cédric Champeau
• Reporter: Shil Sinha
• Created: 07/Oct/15 04:19
• Updated: 22/Feb/16 20:48
• Resolved: 07/Oct/15 19:24

Description

Coercion of parameterless closures (lazy eval blocks) to SAM type arguments results in an NPE during static type checking.

Example:

interface SamType {
    int sam()
}

int foo(SamType samt) {
    samt.sam()
}

@groovy.transform.TypeChecked
void doFoo() {
    assert foo { -> 1 } == 1
}

doFoo()

Results in:

BUG! exception in phase 'instruction selection' in source unit 'ConsoleScript19' unexpected NullpointerException
Caused by: java.lang.NullPointerException