[chr01]
Every character must be locatable in every token in every ref in every source.
Affects: @chars<tok>
@chars
<tok>
Used by template ŧ class-2-expansion-terse class-2-expansion-terse-for-validation, ŧ mark-dependencies-pass-2-for-validation.
ŧ class-2-expansion-terse
ŧ mark-dependencies-pass-2-for-validation