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10.2.7 Special Features for Use in D Actions

Here is a table of Bison constructs, variables and functions that are useful in actions.

Variable: $$ ¶

Acts like a variable that contains the semantic value for the grouping made by the current rule. See Actions.

Variable: $n ¶

Acts like a variable that contains the semantic value for the nth component of the current rule. See Actions.

Function: yyerrok ¶

Resume generating error messages immediately for subsequent syntax errors. This is useful primarily in error rules. See Error Recovery.