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bug#32605: 26.1; (random) never returns negative

From: Francis Wright
Subject: bug#32605: 26.1; (random) never returns negative
Date: Sat, 01 Sep 2018 18:18:01 +0100

According to my reading of both the documentation for the function
random and its description in the manual, if it is called with no
argument then "the value might be any integer representable in Lisp,
i.e., an integer between ‘most-negative-fixnum’ and
‘most-positive-fixnum’".  Therefore, it should return a negative integer
half the time, but I have never yet seen it return a negative value.  So
either the documentation or the implementation is wrong.  For what it's
worth, I would prefer the documented behaviour over the current actual

In GNU Emacs 26.1 (build 1, x86_64-w64-mingw32)
 of 2018-05-30 built on CIRROCUMULUS
Repository revision: 07f8f9bc5a51f5aa94eb099f3e15fbe0c20ea1ea
Windowing system distributor 'Microsoft Corp.', version 10.0.17134
Recent messages:
Canceling debug-on-entry for all functions
You can run the command ‘cancel-debug-on-entry’ with M-x ca-d-e RET
Canceling debug-on-entry for all functions
1515484088033472457 / 2067076301065092720
t [2 times]
Mark set [2 times]
Saving file c:/Users/fjw/address@hidden/emacs/REDUCE/Big Integer 
Wrote c:/Users/fjw/address@hidden/emacs/REDUCE/Big Integer Support/eslbigint.el
Type "q" in help window to restore its previous buffer.
mwheel-scroll: End of buffer [6 times]
mwheel-scroll: Beginning of buffer [9 times]
Configured using:
 'configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''

Configured features:

Important settings:
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  locale-coding-system: cp1252

Major mode: Info

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Load-path shadows:
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Memory information:
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