bug#30499: 26.0.91; Compiler warning cannot be suppressed

[Francis Wright]

(with-no-warnings (byte-compile '(:foo)))

produces the warning

Warning: ‘:foo’ called as a function

Setting byte-compile-warnings to nil also does not suppress this
warning.  So either the documentation or the operation of both
with-no-warnings and byte-compile-warnings is incorrect.

In fact, it seems a little inconsistent to me that none of

(defun :foo ())

(byte-compile ':foo)

(:foo)

produces any warning, but compiling the call of :foo does produce a
warning.


In GNU Emacs 26.0.91 (build 1, x86_64-w64-mingw32)
 of 2018-01-23 built on MONOLITH
Windowing system distributor 'Microsoft Corp.', version 10.0.16299
Recent messages:
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Making completion list... [2 times]
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Type C-x 1 to delete the help window.
Type "q" in help window to restore its previous buffer.

Configured using:
 'configure --prefix=/d/emacs/emacs-26.0.91 --without-imagemagick
 --without-dbus'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS LCMS2

Important settings:
  value of $LANG: ENG
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
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  shell-dirtrack-mode: t
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  delete-selection-mode: t
  electric-pair-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
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  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  horizontal-scroll-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils warnings cl-extra compile eieio-opt speedbar sb-image ezimage
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epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp
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mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
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Memory information:
((conses 16 258989 13496)
 (symbols 56 25373 1)
 (miscs 48 138 312)
 (strings 32 46389 1599)
 (string-bytes 1 1286336)
 (vectors 16 41749)
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