Function SCIPcallExprPrint 

pub unsafe extern "C" fn SCIPcallExprPrint(
    scip: *mut SCIP,
    expr: *mut SCIP_EXPR,
    stage: SCIP_EXPRITER_STAGE,
    currentchild: c_int,
    parentprecedence: c_uint,
    file: *mut FILE,
) -> SCIP_RETCODE

calls the print callback for an expression

@see SCIP_DECL_EXPRPRINT