Prompted by a problem report by Alex in:
http://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00143.html
* src/eval.c (For, Fprogn, Fsetq, FletX, eval_sub):
Compute XCDR (x) near XCAR (x); although this doesn't fix any bugs,
it is likely to run a bit faster with typical hardware caches.
(Fif): Use Fcdr instead of XCDR, to avoid crashing on
self-modifying S-expressions.
(Fsetq, Flet, eval_sub): Count the number of arguments as we go
instead of trusting an Flength prepass, to avoid problems when the
code is self-modifying.
(Fquote, Ffunction, Fdefvar, Fdefconst): Prefer !NILP to CONSP
where either will do. This is mostly to document the fact that
the value must be a proper list. It's also a tiny bit faster on
typical machines nowadays.
(Fdefconst, FletX): Prefer XCAR+XCDR to Fcar+Fcdr when either will do.
(eval_sub): Check that the args are a list as opposed to some
other object that has a length. This prevents e.g. (if . "string")
from making Emacs dump core in some cases.
* test/src/eval-tests.el (eval-tests--if-dot-string)
(eval-tests--let-with-circular-defs, eval-tests--mutating-cond):
New tests.
"Fix ert-tests when running compiled" 2016-12-06 accidentally
introduced a dependency on `bytecomp' into `ert'. As mentioned in
"Avoid ert test failures" 2017-04-18, the accidental dependency of ert
on bytecomp was masked by loading other libraries until recently.
* lisp/emacs-lisp/ert.el (ert--expand-should-1): Only use
`byte-compile-macro-environment' if it's bound.
* test/src/eval-tests.el: Add defvar for dynamic variable
`byte-compile-debug'.
'let' and 'let*' document that their first argument has to be a list,
but don't check for that; instead, they allow (and silently ignore)
other types. Introduce an explicit type check.
* src/eval.c (Flet, FletX): Check that the variable list is indeed a
list.
* test/src/eval-tests.el: Add unit tests.
See Bug#24673
* src/eval.c (funcall_lambda): Fix crash for bogus functions such
as (closure).
* test/src/eval-tests.el (eval-tests--bug24673): Add test.
