bug#32476: 27.0.50; Assertion failure for dot-terminated large int

[Stefan Monnier <monnier@IRO.UMontreal.CA>]

Package: Emacs
Version: 27.0.50


With the nw bignum code in Emacs master, reading a large integer with
trailing dot triggers an assertion failure:

    M-: 4294967295. RET

for me triggers the problem (seen in elpa/packages/xelb/xcb-types.el).
I suspect on a 64bit host you'll need:

    M-: 18446744073709551615. RET

to trigger the same bug (the integer needs to be large enough not to
fit in a Lisp fixnum but small enough to fit in a uintmax_t).

The assertion that fails is the `eassert (check == 0)`
in alloc.c:make_bignum_str.

BTW, I was surprised to discover that until now "42." was read as the
*integer* of value 42 rather than the float of that value.  I guess
we're stuck with this behavior but I find it odd.


        Stefan




In GNU Emacs 27.0.50 (build 1, x86_64-unknown-linux-gnu, GTK+ Version 3.22.30)
 of 2018-08-19 built on alfajor
Repository revision: 14acf8634c0b359fbbd3234dff65b40d9a12f26d
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Debian GNU/Linux buster/sid

Recent messages:
Required package ‘helm-1.0’ is unavailable
Unable to activate package ‘ebdb-i18n-chn’.
Required package ‘pyim-1.6.0’ is unavailable
Loading /home/monnier/src/elisp/ProofGeneral/generic/proof-site.el (source)...done
Loading /home/monnier/etc/emacs/X11.el (source)...done
Loading /home/monnier/etc/emacs/custom.el (source)...done
Ispell-kill: nil american
Starting new Ispell process /usr/bin/aspell with american dictionary...
Warning: hide-sublevels is obsolete!
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
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/home/monnier/src/emacs/elpa/packages/hyperbole/set hides /home/monnier/src/emacs/work/lisp/emacs-lisp/set
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Features:
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Memory information:
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