unless the memory it points to is pinned with [runtime.Pinner] and the
Pinner is not unpinned while the Go pointer is stored in C memory.
This implies that C code may not keep a copy of a string, slice,
channel, and so forth, because they cannot be pinned with
[runtime.Pinner].

The _GoString_ type also may not be pinned with [runtime.Pinner].
Because it includes a Go pointer, the memory it points to is only pinned

				name = st.Field[0].Name
				ident[name] = name
				ft = st.Field[0].Type
			}
		}

		// TODO: Handle fields that are anonymous structs by
		// promoting the fields of the inner struct.

		t := c.Type(ft, pos)
		tgo := t.Go
		size := t.Size
		talign := t.Align
		if f.BitOffset > 0 || f.BitSize > 0 {
			// The layout of bitfields is implementation defined,