diff --git a/src/dscanner/analysis/asm_style.d b/src/dscanner/analysis/asm_style.d
index 60db029d..73a6e532 100644
--- a/src/dscanner/analysis/asm_style.d
+++ b/src/dscanner/analysis/asm_style.d
@@ -32,11 +32,13 @@ final class AsmStyleCheck : BaseAnalyzer
 		if (brExp.asmBrExp !is null && brExp.asmBrExp.asmUnaExp !is null
 				&& brExp.asmBrExp.asmUnaExp.asmPrimaryExp !is null)
 		{
-			addErrorMessage(brExp, "dscanner.confusing.brexp",
+			addErrorMessage(brExp, KEY,
 					"This is confusing because it looks like an array index. Rewrite a[1] as [a + 1] to clarify.");
 		}
 		brExp.accept(this);
 	}
+
+	private enum string KEY = "dscanner.confusing.brexp";
 }
 
 unittest
diff --git a/src/dscanner/analysis/del.d b/src/dscanner/analysis/del.d
index dc6a37de..a97de00d 100644
--- a/src/dscanner/analysis/del.d
+++ b/src/dscanner/analysis/del.d
@@ -27,12 +27,14 @@ final class DeleteCheck : BaseAnalyzer
 
 	override void visit(const DeleteExpression d)
 	{
-		addErrorMessage(d.tokens[0], "dscanner.deprecated.delete_keyword",
+		addErrorMessage(d.tokens[0], KEY,
 				"Avoid using the 'delete' keyword.",
 				[AutoFix.replacement(d.tokens[0], `destroy(`, "Replace delete with destroy()")
 					.concat(AutoFix.insertionAfter(d.tokens[$ - 1], ")"))]);
 		d.accept(this);
 	}
+
+	private enum string KEY = "dscanner.deprecated.delete_keyword";
 }
 
 unittest
diff --git a/src/dscanner/analysis/duplicate_attribute.d b/src/dscanner/analysis/duplicate_attribute.d
index 7e6ec446..647e576a 100644
--- a/src/dscanner/analysis/duplicate_attribute.d
+++ b/src/dscanner/analysis/duplicate_attribute.d
@@ -93,7 +93,7 @@ final class DuplicateAttributeCheck : BaseAnalyzer
 		if (hasAttribute)
 		{
 			string message = "Attribute '%s' is duplicated.".format(attributeName);
-			addErrorMessage(tokens, "dscanner.unnecessary.duplicate_attribute", message,
+			addErrorMessage(tokens, KEY, message,
 				[AutoFix.replacement(tokens, "", "Remove second attribute " ~ attributeName)]);
 		}
 
@@ -149,6 +149,8 @@ final class DuplicateAttributeCheck : BaseAnalyzer
 
 		return null;
 	}
+
+	private enum string KEY = "dscanner.unnecessary.duplicate_attribute";
 }
 
 unittest
diff --git a/src/dscanner/analysis/enumarrayliteral.d b/src/dscanner/analysis/enumarrayliteral.d
index a2e69dd5..96fcc0ca 100644
--- a/src/dscanner/analysis/enumarrayliteral.d
+++ b/src/dscanner/analysis/enumarrayliteral.d
@@ -47,7 +47,7 @@ final class EnumArrayLiteralCheck : BaseAnalyzer
 				if (part.initializer.nonVoidInitializer.arrayInitializer is null)
 					continue;
 				addErrorMessage(part.initializer.nonVoidInitializer,
-						"dscanner.performance.enum_array_literal",
+						KEY,
 						"This enum may lead to unnecessary allocation at run-time."
 						~ " Use 'static immutable "
 						~ part.identifier.text ~ " = [ ...' instead.",
@@ -58,6 +58,8 @@ final class EnumArrayLiteralCheck : BaseAnalyzer
 		}
 		autoDec.accept(this);
 	}
+
+	private enum string KEY = "dscanner.performance.enum_array_literal";
 }
 
 unittest
diff --git a/src/dscanner/analysis/has_public_example.d b/src/dscanner/analysis/has_public_example.d
index c5040506..d8f21b78 100644
--- a/src/dscanner/analysis/has_public_example.d
+++ b/src/dscanner/analysis/has_public_example.d
@@ -88,6 +88,8 @@ final class HasPublicExampleCheck : BaseAnalyzer
 
 private:
 
+	enum string KEY = "dscanner.style.has_public_example";
+
 	bool hasDitto(Decl)(const Decl decl)
 	{
 		import ddoc.comments : parseComment;
@@ -164,7 +166,7 @@ private:
 	{
 		import std.string : format;
 
-		addErrorMessage(tokens, "dscanner.style.has_public_example", name is null
+		addErrorMessage(tokens, KEY, name is null
 				? "Public declaration has no documented example."
 				: format("Public declaration '%s' has no documented example.", name));
 	}
diff --git a/src/dscanner/analysis/ifelsesame.d b/src/dscanner/analysis/ifelsesame.d
index 13dcbe8f..ca8a3ee8 100644
--- a/src/dscanner/analysis/ifelsesame.d
+++ b/src/dscanner/analysis/ifelsesame.d
@@ -39,7 +39,7 @@ final class IfElseSameCheck : BaseAnalyzer
 			// extend 1 past, so we include the `else` token
 			tokens = (tokens.ptr - 1)[0 .. tokens.length + 1];
 			addErrorMessage(tokens,
-					"dscanner.bugs.if_else_same", "'Else' branch is identical to 'Then' branch.");
+					IF_ELSE_SAME_KEY, "'Else' branch is identical to 'Then' branch.");
 		}
 		ifStatement.accept(this);
 	}
@@ -50,7 +50,7 @@ final class IfElseSameCheck : BaseAnalyzer
 		if (e !is null && assignExpression.operator == tok!"="
 				&& e.ternaryExpression == assignExpression.ternaryExpression)
 		{
-			addErrorMessage(assignExpression, "dscanner.bugs.self_assignment",
+			addErrorMessage(assignExpression, SELF_ASSIGNMENT_KEY,
 					"Left side of assignment operatior is identical to the right side.");
 		}
 		assignExpression.accept(this);
@@ -62,7 +62,7 @@ final class IfElseSameCheck : BaseAnalyzer
 				&& andAndExpression.left == andAndExpression.right)
 		{
 			addErrorMessage(andAndExpression.right,
-					"dscanner.bugs.logic_operator_operands",
+					LOGIC_OPERATOR_OPERANDS_KEY,
 					"Left side of logical and is identical to right side.");
 		}
 		andAndExpression.accept(this);
@@ -74,11 +74,17 @@ final class IfElseSameCheck : BaseAnalyzer
 				&& orOrExpression.left == orOrExpression.right)
 		{
 			addErrorMessage(orOrExpression.right,
-					"dscanner.bugs.logic_operator_operands",
+					LOGIC_OPERATOR_OPERANDS_KEY,
 					"Left side of logical or is identical to right side.");
 		}
 		orOrExpression.accept(this);
 	}
+
+private:
+
+	enum string IF_ELSE_SAME_KEY = "dscanner.bugs.if_else_same";
+	enum string SELF_ASSIGNMENT_KEY = "dscanner.bugs.self_assignment";
+	enum string LOGIC_OPERATOR_OPERANDS_KEY = "dscanner.bugs.logic_operator_operands";
 }
 
 unittest
diff --git a/src/dscanner/analysis/label_var_same_name_check.d b/src/dscanner/analysis/label_var_same_name_check.d
index 86fd8a74..b915006b 100644
--- a/src/dscanner/analysis/label_var_same_name_check.d
+++ b/src/dscanner/analysis/label_var_same_name_check.d
@@ -60,6 +60,8 @@ final class LabelVarNameCheck : ScopedBaseAnalyzer
 
 private:
 
+	enum string KEY = "dscanner.suspicious.label_var_same_name";
+
 	Thing[string][] stack;
 
 	template AggregateVisit(NodeType)
@@ -88,7 +90,7 @@ private:
 			{
 				immutable thisKind = fromLabel ? "Label" : "Variable";
 				immutable otherKind = thing.isVar ? "variable" : "label";
-				addErrorMessage(name, "dscanner.suspicious.label_var_same_name",
+				addErrorMessage(name, KEY,
 						thisKind ~ " \"" ~ fqn ~ "\" has the same name as a "
 						~ otherKind ~ " defined on line " ~ to!string(thing.line) ~ ".");
 			}
diff --git a/src/dscanner/analysis/length_subtraction.d b/src/dscanner/analysis/length_subtraction.d
index 197c1522..40a586ee 100644
--- a/src/dscanner/analysis/length_subtraction.d
+++ b/src/dscanner/analysis/length_subtraction.d
@@ -18,6 +18,8 @@ import dsymbol.scope_;
  */
 final class LengthSubtractionCheck : BaseAnalyzer
 {
+	private enum string KEY = "dscanner.suspicious.length_subtraction";
+
 	alias visit = BaseAnalyzer.visit;
 
 	mixin AnalyzerInfo!"length_subtraction_check";
@@ -40,7 +42,7 @@ final class LengthSubtractionCheck : BaseAnalyzer
 			if (l.identifierOrTemplateInstance is null
 					|| l.identifierOrTemplateInstance.identifier.text != "length")
 				goto end;
-			addErrorMessage(addExpression, "dscanner.suspicious.length_subtraction",
+			addErrorMessage(addExpression, KEY,
 					"Avoid subtracting from '.length' as it may be unsigned.",
 					[
 						AutoFix.insertionBefore(l.tokens[0], "cast(ptrdiff_t) ", "Cast to ptrdiff_t")
diff --git a/src/dscanner/analysis/local_imports.d b/src/dscanner/analysis/local_imports.d
index 41e1e5f8..f6df2b24 100644
--- a/src/dscanner/analysis/local_imports.d
+++ b/src/dscanner/analysis/local_imports.d
@@ -59,7 +59,7 @@ final class LocalImportCheck : BaseAnalyzer
 				if (singleImport.rename.text.length == 0)
 				{
 					addErrorMessage(singleImport,
-							"dscanner.suspicious.local_imports", "Local imports should specify"
+							KEY, "Local imports should specify"
 							~ " the symbols being imported to avoid hiding local symbols.");
 				}
 			}
@@ -68,6 +68,8 @@ final class LocalImportCheck : BaseAnalyzer
 
 private:
 
+	enum string KEY = "dscanner.suspicious.local_imports";
+
 	mixin template visitThing(T)
 	{
 		override void visit(const T thing)
diff --git a/src/dscanner/analysis/numbers.d b/src/dscanner/analysis/numbers.d
index bc95cc19..a9629966 100644
--- a/src/dscanner/analysis/numbers.d
+++ b/src/dscanner/analysis/numbers.d
@@ -39,12 +39,15 @@ public:
 				&& ((t.text.startsWith("0b") && !t.text.matchFirst(badBinaryRegex)
 					.empty) || !t.text.matchFirst(badDecimalRegex).empty))
 		{
-			addErrorMessage(t, "dscanner.style.number_literals",
+			addErrorMessage(t, KEY,
 					"Use underscores to improve number constant readability.");
 		}
 	}
 
 private:
+
+	enum string KEY = "dscanner.style.number_literals";
+
 	auto badBinaryRegex = ctRegex!(`^0b[01]{9,}`);
 	auto badDecimalRegex = ctRegex!(`^\d{5,}`);
 }
diff --git a/src/dscanner/analysis/objectconst.d b/src/dscanner/analysis/objectconst.d
index b5d50a7f..e000fe52 100644
--- a/src/dscanner/analysis/objectconst.d
+++ b/src/dscanner/analysis/objectconst.d
@@ -68,7 +68,7 @@ final class ObjectConstCheck : BaseAnalyzer
 			if (inAggregate && !constColon && !constBlock && !isDeclationDisabled
 					&& isInteresting(fd.name.text) && !hasConst(fd.memberFunctionAttributes))
 			{
-				addErrorMessage(d.functionDeclaration.name, "dscanner.suspicious.object_const",
+				addErrorMessage(d.functionDeclaration.name, KEY,
 						"Methods 'opCmp', 'toHash', 'opEquals', 'opCast', and/or 'toString' are non-const.");
 			}
 		}
@@ -81,7 +81,11 @@ final class ObjectConstCheck : BaseAnalyzer
 			constBlock = false;
 	}
 
-	private static bool hasConst(const MemberFunctionAttribute[] attributes)
+private:
+
+	enum string KEY = "dscanner.suspicious.object_const";
+
+	static bool hasConst(const MemberFunctionAttribute[] attributes)
 	{
 		import std.algorithm : any;
 
@@ -89,15 +93,14 @@ final class ObjectConstCheck : BaseAnalyzer
 				|| a.tokenType == tok!"immutable" || a.tokenType == tok!"inout");
 	}
 
-	private static bool isInteresting(string name)
+	static bool isInteresting(string name)
 	{
 		return name == "opCmp" || name == "toHash" || name == "opEquals"
 			|| name == "toString" || name == "opCast";
 	}
 
-	private bool constBlock;
-	private bool constColon;
-
+	bool constBlock;
+	bool constColon;
 }
 
 unittest
diff --git a/src/dscanner/analysis/redundant_storage_class.d b/src/dscanner/analysis/redundant_storage_class.d
index 75a0bf48..2570c566 100644
--- a/src/dscanner/analysis/redundant_storage_class.d
+++ b/src/dscanner/analysis/redundant_storage_class.d
@@ -59,9 +59,11 @@ final class RedundantStorageClassCheck : BaseAnalyzer
 				return;
 			auto t = vd.declarators[0].name;
 			string message = REDUNDANT_VARIABLE_ATTRIBUTES.format(t.text, globalAttributes);
-			addErrorMessage(t, "dscanner.unnecessary.duplicate_attribute", message);
+			addErrorMessage(t, KEY, message);
 		}
 	}
+
+	private enum string KEY = "dscanner.unnecessary.duplicate_attribute";
 }
 
 unittest
diff --git a/src/dscanner/analysis/undocumented.d b/src/dscanner/analysis/undocumented.d
index 815ed008..6e44281b 100644
--- a/src/dscanner/analysis/undocumented.d
+++ b/src/dscanner/analysis/undocumented.d
@@ -146,6 +146,8 @@ final class UndocumentedDeclarationCheck : BaseAnalyzer
 
 private:
 
+	enum string KEY = "dscanner.style.undocumented_declaration";
+
 	mixin template V(T)
 	{
 		override void visit(const T declaration)
@@ -223,7 +225,7 @@ private:
 	{
 		import std.string : format;
 
-		addErrorMessage(range, "dscanner.style.undocumented_declaration", name is null
+		addErrorMessage(range, KEY, name is null
 				? "Public declaration is undocumented."
 				: format("Public declaration '%s' is undocumented.", name));
 	}
diff --git a/src/dscanner/analysis/unmodified.d b/src/dscanner/analysis/unmodified.d
index 79663beb..b6051cd4 100644
--- a/src/dscanner/analysis/unmodified.d
+++ b/src/dscanner/analysis/unmodified.d
@@ -189,6 +189,8 @@ final class UnmodifiedFinder : BaseAnalyzer
 
 private:
 
+	enum string KEY = "dscanner.suspicious.unmodified";
+
 	template PartsMightModify(T)
 	{
 		override void visit(const T t)
@@ -300,7 +302,7 @@ private:
 		{
 			immutable string errorMessage = "Variable " ~ vi.name
 				~ " is never modified and could have been declared const or immutable.";
-			addErrorMessage(vi.token, "dscanner.suspicious.unmodified", errorMessage);
+			addErrorMessage(vi.token, KEY, errorMessage);
 		}
 		tree = tree[0 .. $ - 1];
 	}
diff --git a/src/dscanner/analysis/unused_label.d b/src/dscanner/analysis/unused_label.d
index b5d7efe8..fac4174a 100644
--- a/src/dscanner/analysis/unused_label.d
+++ b/src/dscanner/analysis/unused_label.d
@@ -115,6 +115,8 @@ final class UnusedLabelCheck : BaseAnalyzer
 
 private:
 
+	enum string KEY = "dscanner.suspicious.unused_label";
+
 	static struct Label
 	{
 		string name;
@@ -144,7 +146,7 @@ private:
 			}
 			else if (!label.used)
 			{
-				addErrorMessage(label.token, "dscanner.suspicious.unused_label",
+				addErrorMessage(label.token, KEY,
 						"Label \"" ~ label.name ~ "\" is not used.");
 			}
 		}
diff --git a/src/dscanner/analysis/useless_initializer.d b/src/dscanner/analysis/useless_initializer.d
index 75966129..f2867d19 100644
--- a/src/dscanner/analysis/useless_initializer.d
+++ b/src/dscanner/analysis/useless_initializer.d
@@ -34,7 +34,7 @@ final class UselessInitializerChecker : BaseAnalyzer
 
 private:
 
-	enum key = "dscanner.useless-initializer";
+	enum string KEY = "dscanner.useless-initializer";
 
 	version(unittest)
 	{
@@ -161,7 +161,7 @@ public:
 			{
 				void warn(const BaseNode range)
 				{
-					addErrorMessage(range, key, msg);
+					addErrorMessage(range, KEY, msg);
 				}
 			}
 			else
@@ -169,7 +169,7 @@ public:
 				import std.format : format;
 				void warn(const BaseNode range)
 				{
-					addErrorMessage(range, key, msg.format(declarator.name.text));
+					addErrorMessage(range, KEY, msg.format(declarator.name.text));
 				}
 			}