A place where anything is possible but nothing of interest is practical. Alan M.
Turing helped lay the foundations of computer science by showing that all
machines and languages capable of expressing a certain very primitive set of
operations are logically equivalent in the kinds of computations they can carry
out, and in principle have capabilities that differ only in speed from those of
the most powerful and elegantly designed computers. However, no machine or
language exactly matching Turing's primitive set has ever been built (other than
possibly as a classroom exercise), because it would be horribly slow and far too
painful to use.
A "Turing tar-pit" is any computer language or other tool that shares this
property. That is, it's theoretically universal but in practice, the harder you
struggle to get any real work done, the deeper its inadequacies suck you in.
Compare bondage-and-discipline language.
A tar pit is a geological occurence where subterranean tar leaks to the surface,
creating a large puddle (or pit) of tar. Animals wandering or falling in get
stuck, being unable to extricate themselves from the tar. La Brea, California,
has a museum built around the fossilized remains of mammals and birds found in
such a tar pit.
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