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The tt(%stype) directive is used to specify a single semantic value type. By
default the semantic value type is tt(int). For single type semantic values
several dollar-notations are available. If some of the dollar-notations shown
below appear to be redundant: that's because their meanings are identical when
using single type semantic values. Their meanings differ, however, when using
union or polymorphic semantic values. Furthermore, below the notation $1 is
used as a generic reference to semantic values of production rule
components. Instead of $1 other available numbered dollar references can also
be used.
Here is the overview:
includefile(stypedollar.yo)
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