[GROOVY-8176] tap - exception in phase 'instruction selection'

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.0-alpha-1
• Fix Version/s: 2.5.0-beta-1
• Component/s: Compiler
• Assignee: Paul King
• Reporter: Cazacu Mihai
• Created: 04/May/17 08:50
• Updated: 12/Jun/17 00:12
• Resolved: 07/May/17 06:36

Description

import groovy.transform.CompileStatic

@CompileStatic
abstract class Person {
	String firstName
	String lastName
}

@CompileStatic
class Student extends Person {
	Set<String> courses
}

@CompileStatic
final class Converter {
	static <P extends Person> P toUser1(P person, Map map) { // ok
		if (!map) {
			return person
		}

		person.firstName = map['firstName']
		person.lastName = map['lastName']
		return person
	}

	static <P extends Person> P toUser2(P person, Map map) { // ok
		if (!map) {
			return person
		}

		person.tap {
			firstName = map['firstName']
			lastName = map['lastName']
		}
	}

	static <P extends Person> P toUser3(P person, Map map) { // ok
		person.tap {
			firstName = map['firstName']
			lastName = map['lastName']
		}
	}

	// Caught: BUG! exception in phase 'instruction selection' in source unit '/reproducer.groovy' unexpected NullpointerException
	static <P extends Person> P toUser4(P person, Map map) {
		!map ? person : person.tap {
			firstName = map['firstName']
			lastName = map['lastName']
		}
	}

	// static Student toStudent(Map map) {
	// 	!map ? null : toUser4(new Student(), map)
	// }
}

@CompileStatic
class Reproducer {
	static void reproduce() {
		Map map = [firstName: 'John', lastName: 'Doe']

		println Converter.toUser1(new Student(), map).dump()
		println Converter.toUser2(new Student(), map).dump()
		println Converter.toUser3(new Student(), map).dump()
		//println Converter.toUser4(new Student(), map).dump()
		//println Converter.toStudent(map).dump()
	}	
}

Reproducer.reproduce()

Issue Links

• links to: GitHub Pull Request #535