Implement TryFrom for frozen types

[matts1]

This allows you to write code such as:

struct Foo {
  value: ValueTyped<Foo>
}

// Before
let f = Foo{value: ValueTyped::<Foo>::new_err(value)?}

// After
let f = Foo{value: value.try_into()?}

[meta-codesync]

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