diff --git a/lib/elixir/pages/references/unicode-syntax.md b/lib/elixir/pages/references/unicode-syntax.md
index e0b05cca3c..863f6686a6 100644
--- a/lib/elixir/pages/references/unicode-syntax.md
+++ b/lib/elixir/pages/references/unicode-syntax.md
@@ -40,7 +40,7 @@ Make sure all characters in the identifier resolve to a single script or a highl
 restrictive script. See https://hexdocs.pm/elixir/unicode-syntax.html for more information.
 ```
 
-Finally, Elixir will also warn on confusable identifiers in the same file. For example, Elixir will emit a warning if you use both variables `а` (Cyrillic) and `а` (Latin) in your code.
+Finally, Elixir will also warn of confusable identifiers in the same file. For example, Elixir will emit a warning if you use both variables `а` (Cyrillic) and `а` (Latin) in your code.
 
 That's the overall introduction of how Unicode is used in Elixir identifiers. In a nutshell, its goal is to support different writing systems in use today while keeping the Elixir language itself clear and secure.
 
@@ -124,13 +124,13 @@ For instance, the 'HANGUL FILLER' (`ㅤ`) character, which is often invisible, i
 
 ### C2. Confusable detection
 
-Elixir will warn on identifiers that look the same, but aren't. Examples: in `а = a = 1`, the two 'a' characters are Cyrillic and Latin, and could be confused for each other; in `力 = カ = 1`, both are Japanese, but different codepoints, in different scripts of that writing system. Confusable identifiers can lead to hard-to-catch bugs (say, due to copy-pasted code) and can be unsafe, so we will warn about identifiers within a single file that could be confused with each other.
+Elixir will warn of identifiers that look the same, but aren't. Examples: in `а = a = 1`, the two 'a' characters are Cyrillic and Latin, and could be confused for each other; in `力 = カ = 1`, both are Japanese, but different codepoints, in different scripts of that writing system. Confusable identifiers can lead to hard-to-catch bugs (say, due to copy-pasted code) and can be unsafe, so we will warn of identifiers within a single file that could be confused with each other.
 
 We use the means described in Section 4, 'Confusable Detection', with one noted modification:
 
 > Alternatively, it shall declare that it uses a modification, and provide a precise list of character mappings that are added to or removed from the provided ones.
 
-Elixir will not warn on confusability for identifiers made up exclusively of characters in a-z, A-Z, 0-9, and _. This is because ASCII identifiers have existed for so long that the programming community has had their own means of dealing with confusability between identifiers like `l,1` or `O,0` (for instance, fonts designed for programming usually make it easy to differentiate between those characters).
+Elixir will not warn about confusability for identifiers made up exclusively of characters in a-z, A-Z, 0-9, and _. This is because ASCII identifiers have existed for so long that the programming community has had their own means of dealing with confusability between identifiers like `l,1` or `O,0` (for instance, fonts designed for programming usually make it easy to differentiate between those characters).
 
 ### C3. Mixed Script Detection
 
diff --git a/lib/elixir/src/elixir_parser.yrl b/lib/elixir/src/elixir_parser.yrl
index ddbee71633..7f8391dce7 100644
--- a/lib/elixir/src/elixir_parser.yrl
+++ b/lib/elixir/src/elixir_parser.yrl
@@ -203,7 +203,7 @@ matched_op_expr -> comp_op_eol matched_expr : {'$1', '$2'}.
 matched_op_expr -> rel_op_eol matched_expr : {'$1', '$2'}.
 matched_op_expr -> arrow_op_eol matched_expr : {'$1', '$2'}.
 
-%% We warn exclusively for |> and friends because they are used
+%% We warn exclusively of |> and friends because they are used
 %% in other languages with lower precedence than function application,
 %% which can be the source of confusion.
 matched_op_expr -> arrow_op_eol no_parens_one_expr : warn_pipe('$1', '$2'), {'$1', '$2'}.
diff --git a/lib/elixir/test/elixir/kernel/impl_test.exs b/lib/elixir/test/elixir/kernel/impl_test.exs
index 617f1a77eb..95a0b2e837 100644
--- a/lib/elixir/test/elixir/kernel/impl_test.exs
+++ b/lib/elixir/test/elixir/kernel/impl_test.exs
@@ -122,7 +122,7 @@ defmodule Kernel.ImplTest do
     end
   end
 
-  test "warns about undefined module, but does not warn at @impl line" do
+  test "warns of undefined module, but does not warn at @impl line" do
     capture_err =
       capture_err(fn ->
         Code.eval_string("""
@@ -142,7 +142,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Abc\""
   end
 
-  test "warns about undefined behaviour, but does not warn at @impl line" do
+  test "warns of undefined behaviour, but does not warn at @impl line" do
     capture_err =
       capture_err(fn ->
         Code.eval_string("""
@@ -162,7 +162,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Abc\""
   end
 
-  test "warns for callbacks without impl and @impl has been set before" do
+  test "warns of callbacks without impl and @impl has been set before" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -179,7 +179,7 @@ defmodule Kernel.ImplTest do
              "module attribute @impl was not set for macro bar/0 callback (specified in Kernel.ImplTest.MacroBehaviour)"
   end
 
-  test "warns for callbacks without impl and @impl has been set after" do
+  test "warns of callbacks without impl and @impl has been set after" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -220,7 +220,7 @@ defmodule Kernel.ImplTest do
            end) =~ "module attribute @impl was set but no definition follows it"
   end
 
-  test "warns for @impl true and no behaviour" do
+  test "warns of @impl true and no behaviour" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -231,7 +231,7 @@ defmodule Kernel.ImplTest do
            end) =~ "got \"@impl true\" for function foo/0 but no behaviour was declared"
   end
 
-  test "warns for @impl true with callback name not in behaviour" do
+  test "warns of @impl true with callback name not in behaviour" do
     message =
       capture_err(fn ->
         Code.eval_string("""
@@ -250,7 +250,7 @@ defmodule Kernel.ImplTest do
     assert message =~ "* Kernel.ImplTest.Behaviour.foo/0 (function)"
   end
 
-  test "warns for @impl true with macro callback name not in behaviour" do
+  test "warns of @impl true with macro callback name not in behaviour" do
     message =
       capture_err(fn ->
         Code.eval_string("""
@@ -269,7 +269,7 @@ defmodule Kernel.ImplTest do
     assert message =~ "* Kernel.ImplTest.MacroBehaviour.bar/0 (macro)"
   end
 
-  test "warns for @impl true with callback kind not in behaviour" do
+  test "warns of @impl true with callback kind not in behaviour" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -282,7 +282,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl true\" for function foo/0 but no behaviour specifies such callback"
   end
 
-  test "warns for @impl true with wrong arity" do
+  test "warns of @impl true with wrong arity" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -295,7 +295,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl true\" for function foo/1 but no behaviour specifies such callback"
   end
 
-  test "warns for @impl false and there are no callbacks" do
+  test "warns of @impl false and there are no callbacks" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -306,7 +306,7 @@ defmodule Kernel.ImplTest do
            end) =~ "got \"@impl false\" for function baz/1 but no behaviour was declared"
   end
 
-  test "warns for @impl false and it is a callback" do
+  test "warns of @impl false and it is a callback" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -319,7 +319,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl false\" for function foo/0 but it is a callback specified in Kernel.ImplTest.Behaviour"
   end
 
-  test "warns for @impl module and no behaviour" do
+  test "warns of @impl module and no behaviour" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -331,7 +331,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Kernel.ImplTest.Behaviour\" for function foo/0 but no behaviour was declared"
   end
 
-  test "warns for @impl module with callback name not in behaviour" do
+  test "warns of @impl module with callback name not in behaviour" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -344,7 +344,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Kernel.ImplTest.Behaviour\" for function bar/0 but Kernel.ImplTest.Behaviour does not specify such callback"
   end
 
-  test "warns for @impl module with macro callback name not in behaviour" do
+  test "warns of @impl module with macro callback name not in behaviour" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -357,7 +357,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Kernel.ImplTest.MacroBehaviour\" for macro foo/0 but Kernel.ImplTest.MacroBehaviour does not specify such callback"
   end
 
-  test "warns for @impl module with macro callback kind not in behaviour" do
+  test "warns of @impl module with macro callback kind not in behaviour" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -370,7 +370,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Kernel.ImplTest.MacroBehaviour\" for function foo/0 but Kernel.ImplTest.MacroBehaviour does not specify such callback"
   end
 
-  test "warns for @impl module and callback belongs to another known module" do
+  test "warns of @impl module and callback belongs to another known module" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -384,7 +384,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Kernel.ImplTest.Behaviour\" for function bar/0 but Kernel.ImplTest.Behaviour does not specify such callback"
   end
 
-  test "warns for @impl module and callback belongs to another unknown module" do
+  test "warns of @impl module and callback belongs to another unknown module" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -397,7 +397,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Kernel.ImplTest.MacroBehaviour\" for function bar/0 but this behaviour was not declared with @behaviour"
   end
 
-  test "does not warn for @impl when the function with default conforms with several typespecs" do
+  test "does not warn of @impl when the function with default conforms with several typespecs" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.Behaviour
@@ -409,7 +409,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "does not warn for @impl when the function conforms to behaviour but has default value for arg" do
+  test "does not warn of @impl when the function conforms to behaviour but has default value for arg" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.BehaviourWithArgument
@@ -420,7 +420,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "does not warn for @impl when the function conforms to behaviour but has additional trailing default args" do
+  test "does not warn of @impl when the function conforms to behaviour but has additional trailing default args" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.BehaviourWithArgument
@@ -431,7 +431,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "does not warn for @impl when the function conforms to behaviour but has additional leading default args" do
+  test "does not warn of @impl when the function conforms to behaviour but has additional leading default args" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.BehaviourWithArgument
@@ -442,7 +442,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "does not warn for @impl when the function has more args than callback, but they're all defaulted" do
+  test "does not warn of @impl when the function has more args than callback, but they're all defaulted" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.BehaviourWithArgument
@@ -453,7 +453,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "does not warn for @impl with defaults when the same function is defined multiple times" do
+  test "does not warn of @impl with defaults when the same function is defined multiple times" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.BehaviourWithArgument
@@ -468,7 +468,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "does not warn for no @impl when overriding callback" do
+  test "does not warn of no @impl when overriding callback" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.Behaviour
@@ -482,7 +482,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "does not warn for overridable function missing @impl" do
+  test "does not warn of overridable function missing @impl" do
     Code.eval_string(~S"""
     defmodule Kernel.ImplTest.ImplAttributes do
       @behaviour Kernel.ImplTest.Behaviour
@@ -497,7 +497,7 @@ defmodule Kernel.ImplTest do
     """)
   end
 
-  test "warns correctly for missing @impl only for end-user implemented function" do
+  test "warns correctly of missing @impl only for end-user implemented function" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -518,7 +518,7 @@ defmodule Kernel.ImplTest do
              "module attribute @impl was not set for function foo/0 callback (specified in Kernel.ImplTest.Behaviour)"
   end
 
-  test "warns correctly for incorrect @impl in overridable callback" do
+  test "warns correctly of incorrect @impl in overridable callback" do
     assert capture_err(fn ->
              Code.eval_string("""
              defmodule Kernel.ImplTest.ImplAttributes do
@@ -538,7 +538,7 @@ defmodule Kernel.ImplTest do
              "got \"@impl Kernel.ImplTest.MacroBehaviour\" for function foo/0 but Kernel.ImplTest.MacroBehaviour does not specify such callback"
   end
 
-  test "warns only for non-generated functions in non-generated @impl" do
+  test "warns only of non-generated functions in non-generated @impl" do
     message =
       capture_err(fn ->
         Code.eval_string("""
@@ -565,7 +565,7 @@ defmodule Kernel.ImplTest do
     refute message =~ "foo_without_impl/0"
   end
 
-  test "warns only for non-generated functions in non-generated @impl in protocols" do
+  test "warns only of non-generated functions in non-generated @impl in protocols" do
     message =
       capture_err(fn ->
         Code.eval_string("""
@@ -583,7 +583,7 @@ defmodule Kernel.ImplTest do
              "module attribute @impl was not set for function bar/1 callback"
   end
 
-  test "warns only for generated functions in generated @impl" do
+  test "warns only of generated functions in generated @impl" do
     message =
       capture_err(fn ->
         Code.eval_string("""
@@ -598,7 +598,7 @@ defmodule Kernel.ImplTest do
     refute message =~ "foo_with_impl/0"
   end
 
-  test "does not warn for overridable callback when using __before_compile__/1 hook" do
+  test "does not warn of overridable callback when using __before_compile__/1 hook" do
     Code.eval_string(~S"""
     defmodule BeforeCompile do
       defmacro __before_compile__(_) do
diff --git a/lib/elixir/test/elixir/kernel/warning_test.exs b/lib/elixir/test/elixir/kernel/warning_test.exs
index ed6c567a74..58aa6a047b 100644
--- a/lib/elixir/test/elixir/kernel/warning_test.exs
+++ b/lib/elixir/test/elixir/kernel/warning_test.exs
@@ -178,7 +178,7 @@ defmodule Kernel.WarningTest do
   end
 
   describe "unnecessary quotes" do
-    test "does not warn for unnecessary quotes in uppercase atoms/keywords" do
+    test "does not warn of unnecessary quotes in uppercase atoms/keywords" do
       assert capture_eval(~s/:"Foo"/) == ""
       assert capture_eval(~s/["Foo": :bar]/) == ""
       assert capture_eval(~s/:"Foo"/) == ""
@@ -187,7 +187,7 @@ defmodule Kernel.WarningTest do
       assert capture_eval(~s/:"3L1X1R"/) == ""
     end
 
-    test "warns for unnecessary quotes" do
+    test "warns of unnecessary quotes" do
       assert_warn_eval(
         ["nofile:1:1", "found quoted atom \"foo\" but the quotes are not required"],
         ~s/:"foo"/
@@ -206,7 +206,7 @@ defmodule Kernel.WarningTest do
   end
 
   describe "deprecated single quotes in atoms" do
-    test "warns for single quotes in atoms" do
+    test "warns of single quotes in atoms" do
       assert_warn_eval(
         [
           "nofile:1:1",
@@ -216,7 +216,7 @@ defmodule Kernel.WarningTest do
       )
     end
 
-    test "warns twice for single and unnecessary atom quotes" do
+    test "warns twice of single and unnecessary atom quotes" do
       assert_warn_eval(
         [
           "nofile:1:1",
@@ -228,7 +228,7 @@ defmodule Kernel.WarningTest do
       )
     end
 
-    test "warns twice for single and unnecessary call quotes" do
+    test "warns twice of single and unnecessary call quotes" do
       assert_warn_eval(
         [
           "nofile:1:9",
@@ -1029,7 +1029,7 @@ defmodule Kernel.WarningTest do
     purge(Sample)
   end
 
-  test "late function heads do not warn for meta programming" do
+  test "late function heads do not warn of meta programming" do
     assert capture_eval("""
            defmodule Sample1 do
              defmacro __using__(_) do
@@ -1532,7 +1532,7 @@ defmodule Kernel.WarningTest do
     purge(Sample)
   end
 
-  test "ungrouped defs do not warn for meta programming" do
+  test "ungrouped defs do not warn of meta programming" do
     assert capture_eval("""
            defmodule Sample do
              for atom <- [:foo, :bar] do
diff --git a/lib/elixir/test/elixir/module/types/integration_test.exs b/lib/elixir/test/elixir/module/types/integration_test.exs
index d9bde23d4b..b625ebe3ee 100644
--- a/lib/elixir/test/elixir/module/types/integration_test.exs
+++ b/lib/elixir/test/elixir/module/types/integration_test.exs
@@ -1027,7 +1027,7 @@ defmodule Module.Types.IntegrationTest do
       assert_warnings(files, warnings)
     end
 
-    test "do not warn for module defined in local (runtime) context" do
+    test "do not warn of module defined in local (runtime) context" do
       files = %{
         "a.ex" => """
         defmodule A do
@@ -1045,7 +1045,7 @@ defmodule Module.Types.IntegrationTest do
       assert_no_warnings(files)
     end
 
-    test "warn for unrequired module" do
+    test "warn of unrequired module" do
       files = %{
         "ab.ex" => """
         defmodule A do
@@ -1102,7 +1102,7 @@ defmodule Module.Types.IntegrationTest do
       assert_warnings(files, warnings)
     end
 
-    test "warn for external nested module" do
+    test "warn of external nested module" do
       files = %{
         "a.ex" => """
         defmodule A.B do
@@ -1130,7 +1130,7 @@ defmodule Module.Types.IntegrationTest do
       assert_warnings(files, warnings)
     end
 
-    test "warn for compile time context module defined before calls" do
+    test "warn of compile time context module defined before calls" do
       files = %{
         "a.ex" => """
         defmodule A do
@@ -1157,7 +1157,7 @@ defmodule Module.Types.IntegrationTest do
       assert_warnings(files, warnings)
     end
 
-    test "warn for compile time context module defined after calls and aliased" do
+    test "warn of compile time context module defined after calls and aliased" do
       files = %{
         "a.ex" => """
         defmodule A do
diff --git a/lib/mix/lib/mix/tasks/test.ex b/lib/mix/lib/mix/tasks/test.ex
index 78e86ccb17..c37fdce9e4 100644
--- a/lib/mix/lib/mix/tasks/test.ex
+++ b/lib/mix/lib/mix/tasks/test.ex
@@ -652,7 +652,7 @@ defmodule Mix.Tasks.Test do
     test_paths = project[:test_paths] || default_test_paths()
     test_pattern = project[:test_pattern] || "*.{ex,exs}"
 
-    # Warn about deprecated warn configuration
+    # Warn of deprecated warn configuration
     if project[:warn_test_pattern] do
       Mix.shell().info("""
       warning: the `:warn_test_pattern` configuration is deprecated and will be ignored. \
diff --git a/lib/mix/test/mix/tasks/test_test.exs b/lib/mix/test/mix/tasks/test_test.exs
index 67f59ad384..58de9b0f08 100644
--- a/lib/mix/test/mix/tasks/test_test.exs
+++ b/lib/mix/test/mix/tasks/test_test.exs
@@ -636,7 +636,7 @@ defmodule Mix.Tasks.TestTest do
   end
 
   describe "test_load_filters and test_ignore_filters" do
-    test "warns for files that are not loaded and don't match test_ignore_filters" do
+    test "warns of files that are not loaded and don't match test_ignore_filters" do
       in_tmp("test_warn", fn ->
         File.write!("mix.exs", """
         defmodule TestWarn.MixProject do