Regression test for #76144, a panic in refactor.inline.variable.

It was fixed by CL 683535, making it logically a dup of #74347.

-- a/a.go --
package main

type A struct {
	Name string
}

func F(m map[string]A) {
	human := A{
		Name: "foo",
	}
	m["foo"] = human //@codeaction("hu", "refactor.inline.variable", result=out)
}
-- @out/a/a.go --
package main

type A struct {
	Name string
}

func F(m map[string]A) {
	human := A{
		Name: "foo",
	}
	m["foo"] = A{
	Name: "foo",
} //@codeaction("hu", "refactor.inline.variable", result=out)
}
