In C++, creating an instance of a class is fantastically complicated. The class must be initialized, and there is a zoo of different initialization forms: value, direct, aggregate, default, list, copy, etc. Which one foo {} invokes has been the subject of a spec bug. Some of these invoke a constructor, which is like a function, but isn't a function, multiplying the number of concepts involved further. Constructors suffer from bizarre syntactic limitations. They need a special syntax for handling exceptions. The form foo f(); famously declares a function instead of default initializing f. The [dcl.init] section of the spec is about 16 pages long and there are about another dozen about how constructors work in the special member functions section.

In Rust, there is exactly one way to create an instance of a struct: you provide a value for each of its fields.