I was just working on some program in a code base that uses the suffix Id for a field,
but assigning from an struct from another codebase that uses ID instead.
For example given https://play.golang.org/p/9FAMV7mLZE

package main

type it struct {
	ID string
}

func main() {
	i1 := &it{"Foo"}
	if i1.Id != "" {
	}
	i2 := &it{Id: "Bar"}
}

on trying to compile it I get

tmp/sandbox912846952/main.go:9:7: i1.Id undefined (type *it has no field or method Id, but does have ID)
tmp/sandbox912846952/main.go:11:14: unknown field 'Id' in struct literal of type it

Notice the nice hint on line 9 i1.Id undefined (type *it has no field or method Id, but does have ID)
it would be nice(though lengthy) to give a hint on line 14 such as

tmp/sandbox000177384/main.go:11:14: unknown field 'Id' in struct literal of type it (but does have ID)

/cc compiler squad @mdempsky @griesemer @randall77 @rsc.

This is a super low priority issue that I can work on when free(or anyone else is welcome too), ideas and vetoes welcome.