Fix warnings in Elixir 1.20 and require Elixir 1.15 (#1297)

* Fix warnings about missing pin operators in binary patterns

* Require Elixir 1.15+

Author: sabiwara

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         include:
           # Earliest-supported Elixir/Erlang pair.
-          - elixir: "1.14"
+          - elixir: "1.15"
             otp: "24"
             PLUG_CRYPTO_2_0: "false"
 

lib/plug/router/utils.ex

@@ -151,15 +151,15 @@ defmodule Plug.Router.Utils do
       [{prefix_size, match_length}] when match_length == 2 ->
         suffix_size = byte_size(segment) - prefix_size - 2
 
-        <<prefix::binary-size(prefix_size), ?\\, char, suffix::binary-size(suffix_size)>> =
+        <<prefix::binary-size(^prefix_size), ?\\, char, suffix::binary-size(^suffix_size)>> =
           segment
 
         escaped_segment = [prefix <> <<char>> <> suffix | match]
         build_path_clause(rest, params, escaped_segment, guards, post_match, context, compiled)
 
       [{prefix_size, _}] ->
         suffix_size = byte_size(segment) - prefix_size - 1
-        <<prefix::binary-size(prefix_size), char, suffix::binary-size(suffix_size)>> = segment
+        <<prefix::binary-size(^prefix_size), char, suffix::binary-size(^suffix_size)>> = segment
         {param, suffix} = parse_suffix(suffix)
         params = [param | params]
         var = Macro.var(String.to_atom(param), context)

mix.exs

@@ -10,7 +10,7 @@ defmodule Plug.MixProject do
     [
       app: :plug,
       version: @version,
-      elixir: "~> 1.14",
+      elixir: "~> 1.15",
       deps: deps(),
       package: package(),
       description: @description,