> funs(function(si) {
+   mp[si]
+ })
Error: `function(si) {
    mp[si]
}` must be a function name (quoted or unquoted) or an unquoted call, not `function`.

> funs(~mp[.])
Error: `~mp[.]` must be a function name (quoted or unquoted) or an unquoted call, not `~`.

