In C++, a symbol (such as a type name) can be defined within another type.
In stabs, this is sometimes represented by making the name of a symbol
which contains `::
'. Such a pair of colons does not end the name
of the symbol, the way a single colon would (see String Field). I'm
not sure how consistently used or well thought out this mechanism is.
So that a pair of colons in this position always has this meaning,
`:
' cannot be used as a symbol descriptor.
For example, if the string for a stab is `foo::bar::baz:t5=*6
',
then foo::bar::baz
is the name of the symbol, `t
' is the
symbol descriptor, and `5=*6
' is the type information.
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