Function GetRexxVarFromMsg 

pub unsafe fn GetRexxVarFromMsg(
    RexxSysBase: *mut Library,
    var: CONST_STRPTR,
    msgptr: *const RexxMsg,
    value: STRPTR,
) -> LONG

libname: “rexxsyslib.library” (V47) (Kickstart 3.2 / 2020)