[tsimionescu]

Doesn't Rust support having a function as a field of a struct?

If it does, then the order of evaluation of a.foo(b) would depend on whether foo is a field or a "free-standing" function of a, which seems horrible.

Also, there is a simple elegance in having the order of evaluation match the order the symbols are written that should require a very hight bar to reverse, in my opinion at least.

[MereInterest]

It does, but Rust also has separate namespaces for methods and variables. That is, a.foo(b) will always be a method foo and never a field foo, because the syntax is that of a method. In order to access a function object, then call it, you would use (a.foo)(b). The parentheses cause the contents to be parsed as a variable expression.