extract end positions from typespecs #301

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 5s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 20s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 14s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 23s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 27s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 28s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 6s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 13s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 11s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 0s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 11s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 0s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 14s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 55s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	2m 49s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	2m 12s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	2m 32s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	2m 11s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	3m 5s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	2m 58s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	2m 7s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	2m 6s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 58s
	41m 45s

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