diff --git a/Formula/p/packetbeat.rb b/Formula/p/packetbeat.rb
index cc92918be0e7..3323ce238c8b 100644
--- a/Formula/p/packetbeat.rb
+++ b/Formula/p/packetbeat.rb
@@ -40,7 +40,7 @@ def install
       prefix.install "_meta/kibana"
     end
 
-    (bin/"packetbeat").write <<~EOS
+    (bin/"packetbeat").write <<~SH
       #!/bin/sh
       exec #{libexec}/bin/packetbeat \
         --path.config #{etc}/packetbeat \
@@ -48,7 +48,7 @@ def install
         --path.home #{prefix} \
         --path.logs #{var}/log/packetbeat \
         "$@"
-    EOS
+    SH
 
     chmod 0555, bin/"packetbeat" # generate_completions_from_executable fails otherwise
     generate_completions_from_executable(bin/"packetbeat", "completion", shells: [:bash, :zsh])
diff --git a/Formula/p/pandoc-plot.rb b/Formula/p/pandoc-plot.rb
index f8f6477507d5..4098a331f619 100644
--- a/Formula/p/pandoc-plot.rb
+++ b/Formula/p/pandoc-plot.rb
@@ -28,7 +28,7 @@ def install
   end
 
   test do
-    input_markdown_1 = <<~EOS
+    input_markdown_1 = <<~MARKDOWN
       # pandoc-plot demo
 
       ```{.graphviz}
@@ -36,9 +36,9 @@ def install
         pandoc -> plot
       }
       ```
-    EOS
+    MARKDOWN
 
-    input_markdown_2 = <<~EOS
+    input_markdown_2 = <<~MARKDOWN
       # repeat the same thing
 
       ```{.graphviz}
@@ -46,18 +46,18 @@ def install
         pandoc -> plot
       }
       ```
-    EOS
+    MARKDOWN
 
     output_html_1 = pipe_output("pandoc --filter #{bin}/pandoc-plot -f markdown -t html5", input_markdown_1)
     output_html_2 = pipe_output("pandoc --filter #{bin}/pandoc-plot -f markdown -t html5", input_markdown_2)
     filename = output_html_1.match(%r{(plots/[\da-z]+\.png)}i)
 
-    expected_html_2 = <<~EOS
+    expected_html_2 = <<~HTML
       <h1 id="repeat-the-same-thing">repeat the same thing</h1>
       <figure>
       <img src="#{filename}" />
       </figure>
-    EOS
+    HTML
 
     assert_equal expected_html_2, output_html_2
   end
diff --git a/Formula/p/pandoc.rb b/Formula/p/pandoc.rb
index 8c177ec614e0..1f052a956e4f 100644
--- a/Formula/p/pandoc.rb
+++ b/Formula/p/pandoc.rb
@@ -30,16 +30,16 @@ def install
   end
 
   test do
-    input_markdown = <<~EOS
+    input_markdown = <<~MARKDOWN
       # Homebrew
 
       A package manager for humans. Cats should take a look at Tigerbrew.
-    EOS
-    expected_html = <<~EOS
+    MARKDOWN
+    expected_html = <<~HTML
       <h1 id="homebrew">Homebrew</h1>
       <p>A package manager for humans. Cats should take a look at
       Tigerbrew.</p>
-    EOS
+    HTML
     assert_equal expected_html, pipe_output("#{bin}/pandoc -f markdown -t html5", input_markdown)
   end
 end
diff --git a/Formula/p/pandocomatic.rb b/Formula/p/pandocomatic.rb
index 1b1fcefd0395..d492664855d1 100644
--- a/Formula/p/pandocomatic.rb
+++ b/Formula/p/pandocomatic.rb
@@ -50,11 +50,11 @@ def install
 
       A package manager for humans. Cats should take a look at Tigerbrew.
     MARKDOWN
-    expected_html = <<~EOS
+    expected_html = <<~HTML
       <h1 id="homebrew">Homebrew</h1>
       <p>A package manager for humans. Cats should take a look at
       Tigerbrew.</p>
-    EOS
+    HTML
     system bin/"pandocomatic", "-i", "test.md", "-o", "test.html"
     assert_equal expected_html, (testpath/"test.html").read
   end
diff --git a/Formula/p/php-cs-fixer.rb b/Formula/p/php-cs-fixer.rb
index 10e0dfdff1fc..804a0c04f059 100644
--- a/Formula/p/php-cs-fixer.rb
+++ b/Formula/p/php-cs-fixer.rb
@@ -15,10 +15,10 @@ class PhpCsFixer < Formula
   def install
     libexec.install "php-cs-fixer.phar"
 
-    (bin/"php-cs-fixer").write <<~EOS
+    (bin/"php-cs-fixer").write <<~PHP
       #!#{Formula["php@8.3"].opt_bin}/php
       <?php require '#{libexec}/php-cs-fixer.phar';
-    EOS
+    PHP
   end
 
   test do
diff --git a/Formula/p/pip-tools.rb b/Formula/p/pip-tools.rb
index 5678eb2519c9..069bc03ec19a 100644
--- a/Formula/p/pip-tools.rb
+++ b/Formula/p/pip-tools.rb
@@ -62,10 +62,10 @@ def install
   end
 
   test do
-    (testpath/"requirements.in").write <<~EOS
+    (testpath/"requirements.in").write <<~REQUIREMENTS
       pip-tools
       typing-extensions
-    EOS
+    REQUIREMENTS
 
     compiled = shell_output("#{bin}/pip-compile requirements.in -q -o -")
     assert_match "This file is autogenerated by pip-compile", compiled
diff --git a/Formula/p/procyon-decompiler.rb b/Formula/p/procyon-decompiler.rb
index f91a5afeb793..3b1063b61d5a 100644
--- a/Formula/p/procyon-decompiler.rb
+++ b/Formula/p/procyon-decompiler.rb
@@ -18,14 +18,14 @@ def install
   end
 
   test do
-    fixture = <<~EOS
+    fixture = <<~JAVA
       class T
       {
           public static void main(final String[] array) {
               System.out.println("Hello World!");
           }
       }
-    EOS
+    JAVA
 
     (testpath/"T.java").write fixture
     system Formula["openjdk@21"].bin/"javac", "T.java"
diff --git a/Formula/p/protobuf-c.rb b/Formula/p/protobuf-c.rb
index 98346d59c7b5..5c79b0254070 100644
--- a/Formula/p/protobuf-c.rb
+++ b/Formula/p/protobuf-c.rb
@@ -46,7 +46,7 @@ def install
   end
 
   test do
-    testdata = <<~EOS
+    testdata = <<~PROTO
       syntax = "proto3";
       package test;
       message TestCase {
@@ -55,7 +55,7 @@ def install
       message Test {
         repeated TestCase case = 1;
       }
-    EOS
+    PROTO
     (testpath/"test.proto").write testdata
     system Formula["protobuf"].opt_bin/"protoc", "test.proto", "--c_out=."
 
diff --git a/Formula/p/protobuf.rb b/Formula/p/protobuf.rb
index b8ac908f9b38..9f8dbfa81303 100644
--- a/Formula/p/protobuf.rb
+++ b/Formula/p/protobuf.rb
@@ -60,7 +60,7 @@ def install
   end
 
   test do
-    (testpath/"test.proto").write <<~EOS
+    (testpath/"test.proto").write <<~PROTO
       syntax = "proto3";
       package test;
       message TestCase {
@@ -69,7 +69,7 @@ def install
       message Test {
         repeated TestCase case = 1;
       }
-    EOS
+    PROTO
     system bin/"protoc", "test.proto", "--cpp_out=."
   end
 end
diff --git a/Formula/p/protobuf@3.rb b/Formula/p/protobuf@3.rb
index 140d377112ee..97a3abe1ecc7 100644
--- a/Formula/p/protobuf@3.rb
+++ b/Formula/p/protobuf@3.rb
@@ -65,7 +65,7 @@ def install
   end
 
   test do
-    testdata = <<~EOS
+    testdata = <<~PROTO
       syntax = "proto3";
       package test;
       message TestCase {
@@ -74,7 +74,7 @@ def install
       message Test {
         repeated TestCase case = 1;
       }
-    EOS
+    PROTO
     (testpath/"test.proto").write testdata
     system bin/"protoc", "test.proto", "--cpp_out=."
 
diff --git a/Formula/p/protoc-gen-gogo.rb b/Formula/p/protoc-gen-gogo.rb
index 3bc621bbf018..73c136bbe4f3 100644
--- a/Formula/p/protoc-gen-gogo.rb
+++ b/Formula/p/protoc-gen-gogo.rb
@@ -34,14 +34,14 @@ def install
 
   test do
     protofile = testpath/"proto3.proto"
-    protofile.write <<~EOS
+    protofile.write <<~PROTO
       syntax = "proto3";
       package proto3;
       message Request {
         string name = 1;
         repeated int64 key = 2;
       }
-    EOS
+    PROTO
     system "protoc", "--gogo_out=.", "proto3.proto"
     assert_predicate testpath/"proto3.pb.go", :exist?
     refute_predicate (testpath/"proto3.pb.go").size, :zero?
diff --git a/Formula/p/protoc-gen-gogofaster.rb b/Formula/p/protoc-gen-gogofaster.rb
index 9b5a3993cf51..d6c194002388 100644
--- a/Formula/p/protoc-gen-gogofaster.rb
+++ b/Formula/p/protoc-gen-gogofaster.rb
@@ -34,14 +34,14 @@ def install
 
   test do
     protofile = testpath/"proto3.proto"
-    protofile.write <<~EOS
+    protofile.write <<~PROTO
       syntax = "proto3";
       package proto3;
       message Request {
         string name = 1;
         repeated int64 key = 2;
       }
-    EOS
+    PROTO
     system "protoc", "--gogofaster_out=.", "proto3.proto"
     assert_predicate testpath/"proto3.pb.go", :exist?
     refute_predicate (testpath/"proto3.pb.go").size, :zero?
diff --git a/Formula/p/pyqt.rb b/Formula/p/pyqt.rb
index d256b9b5c174..fae81a6c9eb7 100644
--- a/Formula/p/pyqt.rb
+++ b/Formula/p/pyqt.rb
@@ -76,10 +76,10 @@ def install
       next if r.name == "pyqt6-webengine" && OS.mac? && DevelopmentTools.clang_build_version <= 1200
 
       r.stage do
-        inreplace "pyproject.toml", "[tool.sip.project]", <<~EOS
+        inreplace "pyproject.toml", "[tool.sip.project]", <<~TOML
           [tool.sip.project]
           sip-include-dirs = ["#{site_packages}/PyQt#{version.major}/bindings"]
-        EOS
+        TOML
         system sip_install, "--target-dir", site_packages
       end
     end
diff --git a/Formula/p/pyqt@5.rb b/Formula/p/pyqt@5.rb
index 11b7213bcd1f..905615dd9a2f 100644
--- a/Formula/p/pyqt@5.rb
+++ b/Formula/p/pyqt@5.rb
@@ -79,10 +79,10 @@ def install
       next if r.name == "pyqt5-sip"
 
       r.stage do
-        inreplace "pyproject.toml", "[tool.sip.project]", <<~EOS
+        inreplace "pyproject.toml", "[tool.sip.project]", <<~TOML
           [tool.sip.project]
           sip-include-dirs = ["#{site_packages}/PyQt#{version.major}/bindings"]
-        EOS
+        TOML
         system sip_install, "--target-dir", site_packages
       end
     end
diff --git a/Formula/p/python-yq.rb b/Formula/p/python-yq.rb
index abd5072da81a..b724771e330d 100644
--- a/Formula/p/python-yq.rb
+++ b/Formula/p/python-yq.rb
@@ -53,11 +53,11 @@ def install
   end
 
   test do
-    input = <<~EOS
+    input = <<~YAML
       foo:
        bar: 1
        baz: {bat: 3}
-    EOS
+    YAML
     expected = <<~EOS
       3
       ...
diff --git a/Formula/r/remarshal.rb b/Formula/r/remarshal.rb
index 861f9959ac1a..1c0df9ca9c5c 100644
--- a/Formula/r/remarshal.rb
+++ b/Formula/r/remarshal.rb
@@ -79,16 +79,16 @@ def install
 
   test do
     json = "{\"foo.bar\":\"baz\",\"qux\":1}"
-    yaml = <<~EOS.chomp
+    yaml = <<~YAML.chomp
       foo.bar: baz
       qux: 1
 
-    EOS
-    toml = <<~EOS.chomp
+    YAML
+    toml = <<~TOML.chomp
       "foo.bar" = "baz"
       qux = 1
 
-    EOS
+    TOML
     assert_equal yaml, pipe_output("#{bin}/remarshal -if=json -of=yaml", json)
     assert_equal yaml, pipe_output("#{bin}/json2yaml", json)
     assert_equal toml, pipe_output("#{bin}/remarshal -if=yaml -of=toml", yaml)
diff --git a/Formula/r/rgbds.rb b/Formula/r/rgbds.rb
index 9b1eceb6640c..ff512f532816 100644
--- a/Formula/r/rgbds.rb
+++ b/Formula/r/rgbds.rb
@@ -47,12 +47,12 @@ def install
 
   test do
     # Based on https://github.com/rednex/rgbds/blob/HEAD/test/asm/assert-const.asm
-    (testpath/"source.asm").write <<~EOS
+    (testpath/"source.asm").write <<~ASM
       SECTION "rgbasm passing asserts", ROM0[0]
       Label:
         db 0
         assert @
-    EOS
+    ASM
     system bin/"rgbasm", "-o", "output.o", "source.asm"
     system bin/"rgbobj", "-A", "-s", "data", "-p", "data", "output.o"
     system bin/"rgbgfx", test_fixtures("test.png"), "-o", testpath/"test.2bpp"
diff --git a/Formula/r/rqlite.rb b/Formula/r/rqlite.rb
index 68cded879c56..f04bed0f3573 100644
--- a/Formula/r/rqlite.rb
+++ b/Formula/r/rqlite.rb
@@ -32,11 +32,11 @@ def install
     end
     sleep 5
 
-    (testpath/"test.sql").write <<~EOS
+    (testpath/"test.sql").write <<~SQL
       CREATE TABLE foo (id INTEGER NOT NULL PRIMARY KEY, name TEXT)
       .schema
       quit
-    EOS
+    SQL
     output = shell_output("#{bin}/rqlite -p #{port} < test.sql")
     assert_match "foo", output
 
diff --git a/Formula/r/runme.rb b/Formula/r/runme.rb
index e352ebfbbbd5..86f6390af507 100644
--- a/Formula/r/runme.rb
+++ b/Formula/r/runme.rb
@@ -32,7 +32,7 @@ def install
   test do
     system bin/"runme", "--version"
     markdown = (testpath/"README.md")
-    markdown.write <<~EOS
+    markdown.write <<~MARKDOWN
       # Some Markdown
 
       Has some text.
@@ -40,7 +40,7 @@ def install
       ```sh { name=foobar }
       echo "Hello World"
       ```
-    EOS
+    MARKDOWN
     assert_match "Hello World", shell_output("#{bin}/runme run --git-ignore=false foobar")
     assert_match "foobar", shell_output("#{bin}/runme list --git-ignore=false")
   end
diff --git a/Formula/s/salt-lint.rb b/Formula/s/salt-lint.rb
index 47fb8aece7ac..39d4696e75a2 100644
--- a/Formula/s/salt-lint.rb
+++ b/Formula/s/salt-lint.rb
@@ -35,11 +35,11 @@ def install
   end
 
   test do
-    (testpath/"test.sls").write <<~EOS
+    (testpath/"test.sls").write <<~YAML
       /tmp/testfile:
         file.managed:
             - source: salt://{{unspaced_var}}/example
-    EOS
+    YAML
     out = shell_output("#{bin}/salt-lint #{testpath}/test.sls", 2)
     assert_match "[206] Jinja variables should have spaces before and after: '{{ var_name }}'", out
   end
diff --git a/Formula/s/scheme48.rb b/Formula/s/scheme48.rb
index 98b5a00ac1ba..dad45cedce49 100644
--- a/Formula/s/scheme48.rb
+++ b/Formula/s/scheme48.rb
@@ -34,9 +34,9 @@ def install
   end
 
   test do
-    (testpath/"hello.scm").write <<~EOS
+    (testpath/"hello.scm").write <<~SCHEME
       (display "Hello, World!") (newline)
-    EOS
+    SCHEME
 
     expected = <<~EOS
       Hello, World!\#{Unspecific}
diff --git a/Formula/s/solhint.rb b/Formula/s/solhint.rb
index a317e1333846..46513716dbc9 100644
--- a/Formula/s/solhint.rb
+++ b/Formula/s/solhint.rb
@@ -33,13 +33,13 @@ def install
       }
     EOS
 
-    (testpath/"test.sol").write <<~EOS
+    (testpath/"test.sol").write <<~SOLIDITY
       pragma solidity ^0.4.0;
       contract Test {
         function test() {
         }
       }
-    EOS
+    SOLIDITY
     assert_match "error  Code contains empty blocks  no-empty-blocks",
       shell_output("#{bin}/solhint --config #{test_config} test.sol 2>&1", 1)
   end
diff --git a/Formula/s/solidity.rb b/Formula/s/solidity.rb
index 3b31e2d9941b..c200295176f6 100644
--- a/Formula/s/solidity.rb
+++ b/Formula/s/solidity.rb
@@ -48,7 +48,7 @@ def install
   end
 
   test do
-    (testpath/"hello.sol").write <<~EOS
+    (testpath/"hello.sol").write <<~SOLIDITY
       // SPDX-License-Identifier: GPL-3.0
       pragma solidity ^0.8.0;
       contract HelloWorld {
@@ -56,7 +56,7 @@ def install
           return "Hello, World!";
         }
       }
-    EOS
+    SOLIDITY
 
     output = shell_output("#{bin}/solc --bin hello.sol")
     assert_match "hello.sol:HelloWorld", output
diff --git a/Formula/s/statix.rb b/Formula/s/statix.rb
index 30e692a43704..1918e2715e35 100644
--- a/Formula/s/statix.rb
+++ b/Formula/s/statix.rb
@@ -26,9 +26,9 @@ def install
   end
 
   test do
-    (testpath/"test.nix").write <<~EOS
+    (testpath/"test.nix").write <<~NIX
       github:oppiliappan/statix
-    EOS
+    NIX
     assert_match "Found unquoted URI expression", shell_output("#{bin}/statix check test.nix", 1)
 
     system bin/"statix", "fix", "test.nix"
diff --git a/Formula/s/stylelint.rb b/Formula/s/stylelint.rb
index a8abdb7bb25e..d2ac94cbd562 100644
--- a/Formula/s/stylelint.rb
+++ b/Formula/s/stylelint.rb
@@ -22,18 +22,18 @@ def install
   end
 
   test do
-    (testpath/".stylelintrc").write <<~EOS
+    (testpath/".stylelintrc").write <<~JSON
       {
         "rules": {
           "block-no-empty": true
         }
       }
-    EOS
+    JSON
 
-    (testpath/"test.css").write <<~EOS
+    (testpath/"test.css").write <<~CSS
       a {
       }
-    EOS
+    CSS
 
     output = shell_output("#{bin}/stylelint test.css 2>&1", 2)
     assert_match "Unexpected empty block", output
diff --git a/Formula/s/stylish-haskell.rb b/Formula/s/stylish-haskell.rb
index 1a7358c626c2..6fda40496179 100644
--- a/Formula/s/stylish-haskell.rb
+++ b/Formula/s/stylish-haskell.rb
@@ -26,7 +26,7 @@ def install
   end
 
   test do
-    (testpath/"test.hs").write <<~EOS
+    (testpath/"test.hs").write <<~HASKELL
       {-# LANGUAGE ViewPatterns, TemplateHaskell #-}
       {-# LANGUAGE GeneralizedNewtypeDeriving,
                   ViewPatterns,
@@ -39,8 +39,8 @@ module Bad where
 
       import qualified Data.Map as M
       import      Data.Map    ((!), keys, Map)
-    EOS
-    expected = <<~EOS
+    HASKELL
+    expected = <<~HASKELL
       {-# LANGUAGE GeneralizedNewtypeDeriving #-}
       {-# LANGUAGE ScopedTypeVariables        #-}
       {-# LANGUAGE TemplateHaskell            #-}
@@ -52,7 +52,7 @@ module Bad where
 
       import           Data.Map            (Map, keys, (!))
       import qualified Data.Map            as M
-    EOS
+    HASKELL
     assert_equal expected, shell_output("#{bin}/stylish-haskell test.hs")
   end
 end