GNU bug report logs - #41492
GNUMakefile-mode: highlight the $ of $&

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From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
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Subject: GNUMakefile-mode: highlight the $ of $&
Date: Sat, 23 May 2020 17:48:46 +0800
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In a makefile,

/tmp/phony2.xml:/tmp/phony1.xml
	perl -pwle 's/<ZeroBlockHttpCodes>/$&0,/;' $? > $@

the $ should still be highlighted, even though maybe make doesn't have a
$& variable, but still the user needs to know he forgot to double it.

In fact all single $ should be in a highlighted font face.

emacs-version "26.3".