matcher: bugfix: boostrapping chicken-egg-problem.

The previous commit made the general pattern matcher dependent
on calling non-triv-pat-p function. But that function needs
the matcher to work in order to be defined. This has left the
code base uncompilable.

* share/txr/stdlib/match.tl (non-triv-pat-p): Precede the
real definition of non-triv-pat-p with a temporary one which
returns a conservative t value, which suspects all syntx to
be non-trivial. This means that the real non-triv-pat-p can
use match-case, because match-case's expander will be using
the temporary version of the function. non-triv-pat-p won't
benefit from the optimizations arising from identifying
trivial patterns: but since it doesn't have any such patterns,
so it makes no difference.

0 files changed, 0 insertions, 0 deletions