diff --git a/Sources/TextFormation/TextualIndenter+Language.swift b/Sources/TextFormation/TextualIndenter+Language.swift
index e238072..7ec5248 100644
--- a/Sources/TextFormation/TextualIndenter+Language.swift
+++ b/Sources/TextFormation/TextualIndenter+Language.swift
@@ -1,65 +1,71 @@
 import Foundation
 
 public extension TextualIndenter {
-    static let basicPatterns: [PatternMatcher] = [
-        CurrentLinePrefixOutdenter(prefix: "}"),
-        CurrentLinePrefixOutdenter(prefix: ")"),
-        CurrentLinePrefixOutdenter(prefix: "]"),
+	static var basicPatterns: [PatternMatcher] {
+		[
+			CurrentLinePrefixOutdenter(prefix: "}"),
+			CurrentLinePrefixOutdenter(prefix: ")"),
+			CurrentLinePrefixOutdenter(prefix: "]"),
 
-        PreceedingLinePrefixIndenter(prefix: "{"),
-        PreceedingLinePrefixIndenter(prefix: "("),
-        PreceedingLinePrefixIndenter(prefix: "["),
+			PreceedingLinePrefixIndenter(prefix: "{"),
+			PreceedingLinePrefixIndenter(prefix: "("),
+			PreceedingLinePrefixIndenter(prefix: "["),
 
-        PreceedingLineSuffixIndenter(suffix: "{"),
-        PreceedingLineSuffixIndenter(suffix: "("),
-        PreceedingLineSuffixIndenter(suffix: "["),
-    ]
+			PreceedingLineSuffixIndenter(suffix: "{"),
+			PreceedingLineSuffixIndenter(suffix: "("),
+			PreceedingLineSuffixIndenter(suffix: "["),
+		]
+	}
 }
 
 public extension TextualIndenter {
 	/// Specialized indentation patterns for Ruby.
-    static let rubyPatterns: [PatternMatcher] = [
-        CurrentLinePrefixOutdenter(prefix: "else"),
-        CurrentLinePrefixOutdenter(prefix: "elsif"),
-        CurrentLinePrefixOutdenter(prefix: "ensure"),
-        CurrentLinePrefixOutdenter(prefix: "rescue"),
-        CurrentLinePrefixOutdenter(prefix: "when"),
-        CurrentLinePrefixOutdenter(prefix: "end"),
+	static var rubyPatterns: [PatternMatcher] {
+		[
+			CurrentLinePrefixOutdenter(prefix: "else"),
+			CurrentLinePrefixOutdenter(prefix: "elsif"),
+			CurrentLinePrefixOutdenter(prefix: "ensure"),
+			CurrentLinePrefixOutdenter(prefix: "rescue"),
+			CurrentLinePrefixOutdenter(prefix: "when"),
+			CurrentLinePrefixOutdenter(prefix: "end"),
 
-        PreceedingLinePrefixIndenter(prefix: "{"),
-        PreceedingLinePrefixIndenter(prefix: "("),
-        PreceedingLinePrefixIndenter(prefix: "["),
+			PreceedingLinePrefixIndenter(prefix: "{"),
+			PreceedingLinePrefixIndenter(prefix: "("),
+			PreceedingLinePrefixIndenter(prefix: "["),
 
-        PreceedingLineSuffixIndenter(suffix: "{"),
-        PreceedingLineSuffixIndenter(suffix: "("),
-        PreceedingLineSuffixIndenter(suffix: "["),
-        PreceedingLineSuffixIndenter(suffix: "|"),
-        PreceedingLineSuffixIndenter(suffix: "do"),
+			PreceedingLineSuffixIndenter(suffix: "{"),
+			PreceedingLineSuffixIndenter(suffix: "("),
+			PreceedingLineSuffixIndenter(suffix: "["),
+			PreceedingLineSuffixIndenter(suffix: "|"),
+			PreceedingLineSuffixIndenter(suffix: "do"),
 
-        PreceedingLinePrefixIndenter(prefix: "if"),
-        PreceedingLinePrefixIndenter(prefix: "else"),
-        PreceedingLinePrefixIndenter(prefix: "elsif"),
-        PreceedingLinePrefixIndenter(prefix: "ensure"),
-        PreceedingLinePrefixIndenter(prefix: "rescue"),
-        PreceedingLinePrefixIndenter(prefix: "when"),
-        PreceedingLinePrefixIndenter(prefix: "for"),
-        PreceedingLinePrefixIndenter(prefix: "unless"),
-        PreceedingLinePrefixIndenter(prefix: "while"),
-        PreceedingLinePrefixIndenter(prefix: "class"),
-        PreceedingLinePrefixIndenter(prefix: "module"),
-        PreceedingLinePrefixIndenter(prefix: "def"),
-    ]
+			PreceedingLinePrefixIndenter(prefix: "if"),
+			PreceedingLinePrefixIndenter(prefix: "else"),
+			PreceedingLinePrefixIndenter(prefix: "elsif"),
+			PreceedingLinePrefixIndenter(prefix: "ensure"),
+			PreceedingLinePrefixIndenter(prefix: "rescue"),
+			PreceedingLinePrefixIndenter(prefix: "when"),
+			PreceedingLinePrefixIndenter(prefix: "for"),
+			PreceedingLinePrefixIndenter(prefix: "unless"),
+			PreceedingLinePrefixIndenter(prefix: "while"),
+			PreceedingLinePrefixIndenter(prefix: "class"),
+			PreceedingLinePrefixIndenter(prefix: "module"),
+			PreceedingLinePrefixIndenter(prefix: "def"),
+		]
+	}
 
 	/// Specialized indentation patterns for Python.
-	static let pythonPatterns: [PatternMatcher] = [
-		PreceedingLineSuffixIndenter(suffix: ":"),
+	static var pythonPatterns: [PatternMatcher] {
+		[
+			PreceedingLineSuffixIndenter(suffix: ":"),
 
-		PreceedingLinePrefixIndenter(prefix: "{"),
-		PreceedingLinePrefixIndenter(prefix: "("),
-		PreceedingLinePrefixIndenter(prefix: "["),
+			PreceedingLinePrefixIndenter(prefix: "{"),
+			PreceedingLinePrefixIndenter(prefix: "("),
+			PreceedingLinePrefixIndenter(prefix: "["),
 
-		PreceedingLineSuffixIndenter(suffix: "{"),
-		PreceedingLineSuffixIndenter(suffix: "("),
-		PreceedingLineSuffixIndenter(suffix: "["),
-	]
+			PreceedingLineSuffixIndenter(suffix: "{"),
+			PreceedingLineSuffixIndenter(suffix: "("),
+			PreceedingLineSuffixIndenter(suffix: "["),
+		]
+	}
 }
diff --git a/Sources/TextFormation/WhitespaceProviders.swift b/Sources/TextFormation/WhitespaceProviders.swift
index e22e8be..0dc38e1 100644
--- a/Sources/TextFormation/WhitespaceProviders.swift
+++ b/Sources/TextFormation/WhitespaceProviders.swift
@@ -18,9 +18,14 @@ public struct WhitespaceProviders {
 }
 
 extension WhitespaceProviders {
-    public static let passthroughProvider: StringSubstitutionProvider = { $1.substring(from: $0) ?? "" }
-    public static let removeAllProvider: StringSubstitutionProvider =  { _, _ in return "" }
-
-    public static let none = WhitespaceProviders(leadingWhitespace: WhitespaceProviders.passthroughProvider,
-                                                 trailingWhitespace: WhitespaceProviders.passthroughProvider)
+	public static var passthroughProvider: StringSubstitutionProvider {
+		{ $1.substring(from: $0) ?? "" }
+	}
+	public static var removeAllProvider: StringSubstitutionProvider {
+		{ _, _ in return "" }
+	}
+	public static var none: WhitespaceProviders {
+		WhitespaceProviders(leadingWhitespace: WhitespaceProviders.passthroughProvider,
+							trailingWhitespace: WhitespaceProviders.passthroughProvider)
+	}
 }