data tables should support proper line numbers for debugging

Originally reported on Google Code with ID 86

I am using some Data Tables from the 0.4 release, using the sample
from the blog:

01    def "maximum of two numbers"() {
02        expect:
03            Math.max(a, b) == c
04
05        where:
06            a | b | c
07            3 | 7 | 7
08            5 | 4 | 5
09            9 | 9 | 9
10    }

(hopefully, this email is monospaced to you as well)

When using this feature in a debugger, Line 6 is executed 3 times and
line 3 3 times.
It would be nice if line 6 were not executed 3 times and instead line
7, 8, and 8 were executed once.

I think there might be some way to do this by filling in the line
number field inside your AST transformation.

Changing this would make debugging a lot easier.

Reported by HamletDRC on 2010-03-21 17:45:31

Start by examining the data-table AST transformation and how it assigns line-number information, then reproduce the sample data table in a debugger. Done means the individual data rows, rather than the table declaration line, receive the executions' source line numbers.