* doc/bison.texinfo: here.
| exp "-" exp @{ $$ = $1 - $3; @}
| exp "*" exp @{ $$ = $1 * $3; @}
| exp "/" exp @{ $$ = $1 / $3; @}
| exp "-" exp @{ $$ = $1 - $3; @}
| exp "*" exp @{ $$ = $1 * $3; @}
| exp "/" exp @{ $$ = $1 / $3; @}
-| "(" exp ")" @{ std::swap($$, $2); @}
+| "(" exp ")" @{ std::swap ($$, $2); @}
| "identifier" @{ $$ = driver.variables[$1]; @}
| "identifier" @{ $$ = driver.variables[$1]; @}
-| "number" @{ std::swap($$, $1); @};
+| "number" @{ std::swap ($$, $1); @};