"if" statement executes wrong branch
I've stumbled over a rather weird bug where Ruby 2.5+ executes an
else branch of a condition when it should not. The best minimal example I could come up with is this:
def broken foo = 1 if is_true or is_false foo = foo else raise "FAIL" end puts "PASS" end def is_true true end def is_false false end broken()
For me this script raises "FAIL" instead of printing "PASS".
Note that this is actually pretty much minimal; any of the following will "fix" the issue:
- removing the
foo = fooor adding any other code to the
- removing the
Updated by mame (Yusuke Endoh) almost 2 years ago
jeremyevans0 (Jeremy Evans) wrote:
This appears to be a duplicate of #14897.
Yes, it is already fixed in trunk. Please wait for the next release. Anyway, thank you for the report!
OT: I'm surprised that multiple persons encounter this issue because it occurs only when a nonsense assignment like
foo = foo is used.
Updated by shevegen (Robert A. Heiler) almost 2 years ago
occurs only when a nonsense assignment like foo = foo is used.
Could happen because of a typo or the brain-associated with the
fingers in some thought process. I made very strange mistakes
myself; most common one I still make is "=" rather than "=="
simply because I somehow forget to type == (hit = twice). Happens
perhaps 1 in 1000 times only when I am very alert but when I
am quite sleepy it may be 1 in 100 times.
What I mean to say is that we can expect the unexpected as a
result of humans working with computers in general. :)