Update to Elixir 1.17

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ name: elixir / main ci
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
   workflow_dispatch:
 
@@ -17,8 +17,8 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        elixir: [1.16]
-        otp: [26.2]
+        elixir: [1.17]
+        otp: [27.0]
 
     steps:
       - name: Checkout code
@@ -76,8 +76,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - elixir: '1.11.0'
-            otp: '23.2'
           - elixir: '1.12.0'
             otp: '24.0'
           - elixir: '1.13.0'
@@ -88,6 +86,8 @@ jobs:
             otp: '26.0'
           - elixir: '1.16.0'
             otp: '26.2'
+          - elixir: '1.17.0'
+            otp: '27.0'
 
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29

README.md

@@ -8,7 +8,7 @@
 
 ## Setup
 
-The exercises currently target Elixir versions from 1.11 to 1.16 and Erlang/OTP versions from 21 to 26. Detailed installation instructions can be found at
+The exercises currently target Elixir versions from 1.12 to 1.17 and Erlang/OTP versions from 24 to 27. Detailed installation instructions can be found at
 [https://elixir-lang.org/install.html](https://elixir-lang.org/install.html). We recommend using the [asdf version manager](https://github.com/asdf-vm/asdf) to manage multiple Elixir versions.
 
 ## Testing

exercises/concept/rpn-calculator/.meta/exemplar.ex

@@ -15,7 +15,7 @@ defmodule RPNCalculator do
     try do
       {:ok, operation.(stack)}
     rescue
-      e -> {:error, e.message}
+      e in ArgumentError -> {:error, e.message}
     end
   end
 end

exercises/concept/top-secret/test/top_secret_test.exs

@@ -37,41 +37,46 @@ defmodule TopSecretTest do
       end
       """
 
-      ast = {
-        :defmodule,
-        [line: 1],
-        [
-          {:__aliases__, [line: 1], [:List]},
-          [
-            do: {
-              :__block__,
-              [],
-              [
-                {:@, [line: 2],
+      assert {
+               :defmodule,
+               [line: 1],
+               [
+                 {:__aliases__, [line: 1], [:List]},
                  [
-                   {:spec, [line: 2],
-                    [{:"::", [line: 2], [{:delete, [line: 2], [[], {:any, [line: 2], nil}]}, []]}]}
-                 ]},
-                {:@, [line: 3],
-                 [
-                   {:spec, [line: 3],
-                    [
-                      {:"::", [line: 3],
-                       [
-                         {:delete, [line: 3], [[{:..., [line: 3], nil}], {:any, [line: 3], nil}]},
-                         {:list, [line: 3], nil}
-                       ]}
-                    ]}
-                 ]},
-                {:def, [line: 4],
-                 [{:delete, [line: 4], [{:list, [line: 4], nil}, {:element, [line: 4], nil}]}]}
-              ]
-            }
-          ]
-        ]
-      }
-
-      assert TopSecret.to_ast(string) == ast
+                   do: {
+                     :__block__,
+                     [],
+                     [
+                       {:@, [line: 2],
+                        [
+                          {:spec, [line: 2],
+                           [
+                             {:"::", [line: 2],
+                              [{:delete, [line: 2], [[], {:any, [line: 2], nil}]}, []]}
+                           ]}
+                        ]},
+                       {:@, [line: 3],
+                        [
+                          {:spec, [line: 3],
+                           [
+                             {:"::", [line: 3],
+                              [
+                                {:delete, [line: 3],
+                                 [[{:..., [line: 3], _nil_or_empty_list}], {:any, [line: 3], nil}]},
+                                {:list, [line: 3], nil}
+                              ]}
+                           ]}
+                        ]},
+                       {:def, [line: 4],
+                        [
+                          {:delete, [line: 4],
+                           [{:list, [line: 4], nil}, {:element, [line: 4], nil}]}
+                        ]}
+                     ]
+                   }
+                 ]
+               ]
+             } = TopSecret.to_ast(string)
     end
   end
 

exercises/practice/atbash-cipher/.meta/example.ex

@@ -1,5 +1,5 @@
 defmodule Atbash do
-  @key Enum.zip(?a..?z, ?z..?a) |> Enum.into(%{})
+  @key Enum.zip(?a..?z, ?z..?a//-1) |> Enum.into(%{})
 
   @doc """
   Encode a given plaintext to the corresponding ciphertext

exercises/practice/beer-song/.meta/example.ex

@@ -15,7 +15,7 @@ defmodule BeerSong do
     "#{number} bottles of beer on the wall, #{number} bottles of beer.\nTake one down and pass it around, #{number - 1} bottles of beer on the wall.\n"
   end
 
-  def lyrics(range \\ 99..0) do
+  def lyrics(range \\ 99..0//-1) do
     range
     |> Enum.map(&verse/1)
     |> Enum.join("\n")

exercises/practice/isbn-verifier/.meta/example.ex

@@ -18,7 +18,7 @@ defmodule IsbnVerifier do
         isbn
         |> String.replace("-", "")
         |> String.graphemes()
-        |> Enum.zip(10..1)
+        |> Enum.zip(10..1//-1)
         |> Enum.map(&checksum_weighting/1)
         |> Enum.sum()
 

exercises/practice/kindergarten-garden/.meta/example.ex

@@ -51,8 +51,8 @@ defmodule Garden do
     letters = "#{first_row_letters}#{second_row_letters}"
     map = add_to_map(map, current_name, letters)
 
-    first_row = String.slice(first_row, 2..-1)
-    second_row = String.slice(second_row, 2..-1)
+    first_row = String.slice(first_row, 2..-1//-1)
+    second_row = String.slice(second_row, 2..-1//-1)
     populate_map(first_row, second_row, map, student_names)
   end
 

exercises/practice/pascals-triangle/.meta/example.ex

@@ -24,7 +24,7 @@ defmodule PascalsTriangle do
   defp each_cons(list) do
     list
     |> Enum.flat_map(&[&1, &1])
-    |> Enum.slice(1..-2)
+    |> Enum.slice(1..-2//-1)
     |> Enum.chunk_every(2)
   end
 

exercises/practice/sgf-parsing/.meta/example.ex

@@ -134,7 +134,7 @@ defmodule SgfParsing do
       with {:ok, result, rest} <- some(parser).(input) do
         {:ok, result, rest}
       else
-        {:error, _err, ^input} -> {:ok, [], input}
+        {:error, _err, rest} when rest == input -> {:ok, [], input}
         err -> err
       end
     end