Major Description
The line number recorded in the compiled class for Closure is incorrect in certain circumstances.
1. void doThing(Closure c) {
2. c.class()
3. }
4.
5. void go() {
6. doThing { // This is a comment
7. // And there is no body
8. }
9. }
When grabbing the lineNumber (using javassist and loading the doCall method from the CtClass for the Closure), it is reported as line 8, where in Groovy 2.5.x it was reported as line 6. Removing the comments but leaving just a new line between the } and { (an empty block) has the same result.
The expected outcome here should be line 6 as that's the start of the closure.
If you modify the closure like so:
1. void doThing(Closure c) {
2. c.class()
3. }
4.
5. void go() {
6. doThing { // This is a comment
7. println "hi"
8. }
9. }
The line is reported as line 7. This is also incorrect as that would be the BlockStatement inside the Closure.
Trying to debug the parser, I ended up in GroovyParse.blockStatementOpts which appears to be setting the startLine value incorrectly (The below screen shot is from compilation of a similar class where a closure contains only comments). Notice that start is marked as a line number after end which can't really be true.
