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This issue was originally raised in the core reflector as "[c++std-core-25257] The definition of Literal is missing" on 12 May 2014 03:18, Saeed Amrollahi Boyouki. An e-mail thread ensued, and it was decided that some of this could be resolved by fixing references to literal, when used as a grammar term, editorially, and to open a core issue for what remains. Since there are 537 uses of literal in the spec, this is going to take a while... See branch "literal-fixes" for this ongoing effort.
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burblebee commentedon Nov 6, 2014
Richard had the idea that we resolve this problem by defining "literal" to refer to the grammar term literal, when it applies.
[lex.literal] Avoid references to plain 'literal'
jensmaurer commentedon Dec 20, 2016
I've had a look. It seems most mentions of "literal" in [lex] actually refer to a specific (and defined) kind of literal, e.g. "character literal" or "integer literal". There are a few cases where "literal" is used instead of the full phrase as a means of abbreviation. I'm preparing a patch that expands these.
[expr.prim.literal] does use \grammarterm {literal}, which is good.
[lex.literal] Avoid references to plain 'literal' (#1277)