Most statically typed languages developed since the 1970s (including Java, C#, and the descendants of Pascal) use some form of name equivalence for types. Is structural equivalence a bad idea? Why or...

Most statically typed languages developed since the 1970s (including Java, C#, and the descendants of Pascal) use some form of name equivalence for types. Is structural equivalence a bad idea? Why or why not? In the following code, which of the variables will a compiler consider to have compatible types under structural equivalence? Under strict name equivalence? Under loose name equivalence?