AST_MINUS         555 core/compile.c     case AST_PLUS: case AST_MINUS: case AST_TIMES: case AST_DIV:
AST_MINUS         568 core/compile.c         case AST_MINUS: PN_ASM2(OP_SUB, reg, reg + 1);  break;
AST_MINUS          84 core/syntax.y         | minus assign s:sets { e = PN_AST2(ASSIGN, e, PN_OP(AST_MINUS, e, s)) }
AST_MINUS         120 core/syntax.y        | minus x:product     { p = PN_OP(AST_MINUS, p, x) })*
AST_MINUS         135 core/syntax.y         | minus !minus a:atom  { a = PN_OP(AST_MINUS, PN_AST(VALUE, PN_ZERO), a) }