Bug #13022: Nested array syntax error returns nil

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: 2.3.3
• Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[harrywhelchel (Harry Whelchel)]

If you leave out a comma in a nested array, ruby returns nil instead of raising a SyntaxError. Is this expected behavior?

1. Create a nested array with a missing comma:

[[1,3], [5,6] [11, 15], [17,22]] #=> [[1, 3], nil, [17, 22]]

[jeremyevans0 (Jeremy Evans)]

Yes, this is expected behavior. Ruby parses this as:

[[1,3], [5,6].[](11, 15), [17,22]] 

And Array#[] returns nil if the starting index (11) is out of range.

[marcandre (Marc-Andre Lafortune)]

• Status changed from Open to Rejected