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TGRAM.Y
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1987-01-29
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306b
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25 lines
%semantic_parser
%start expr
%token TERM '(' ')'
%right '='
%left '+' '-'
%left '*' '\\'
%left UMINUS
%%
expr : expr '+' expr
| expr '-' expr
| expr '*' expr
| expr '\\' expr
| '(' { $$ = -1; } expr ')' {$$ = $4; }
| '-' expr %prec UMINUS
| TERM
| expr '=' expr
;
%%