Go compiler is a little overly conservative with names of attributes

Go compiler, in attempting to avoid using variable names that are reserved words in Go, is being a little overly conservative.

For example, if you have a struct like this:-

struct NamesTest {
		1: required string type
}

One would expect it to compile to:-

type NamesTest struct {
	Type string `thrift:"type,1,required" json:"type"`
}

Rather than:-

type NamesTest struct {
	TypeA1 string `thrift:"type,1,required" json:"type"`
}