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@:
: Pseudo-colon@:
is an invisible colon (see Pseudo-operators).
It can be helpful in formatting certain C constructions correctly. For
example, if one has a named module defined as
@<Cases@>= case 1: case 2: case 3@: @;
then one can use it as a case construction followed by the usual colon, as in
switch(c) { @<Cases@>: stuff; break; }