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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
gotcha
A misfeature of a system, especially a
programming language or environment, that tends to breed
bugs or mistakes because it both enticingly easy to invoke
and completely unexpected and/or unreasonable in its outcome.
For example, a classic gotcha in C is the fact that
if (a=b) code;
is syntactically valid and sometimes even correct. It puts
the value of "b" into "a" and then executes "code" if "a" is
non-zero. What the programmer probably meant was
if (a==b) code;
which executes "code" if "a" and "b" are equal.
[Jargon File]
(1995-04-17)