diff --git a/src/struct.ts b/src/struct.ts
index 7aa5801..e3e0b55 100644
--- a/src/struct.ts
+++ b/src/struct.ts
@@ -202,6 +202,7 @@ export class Struct {
             if (!method.isInherited) {
                 out += method.generateTypedef();
                 out += `extern ${method.generateDefinition()}`;
+                out += `extern ${method.generateDefinition('_unedited')}`;
                 out += method.generateNewMethodTest(this.#directParent, '', '');
             }
         }
@@ -260,6 +261,8 @@ export class Struct {
             if (!method.isInherited) {
                 init += `${INDENT}${method.getName()} = (${method.getType()}) ${toHex(method.address)};\n`;
                 declarations += method.generateDefinition();
+                init += `${INDENT}${method.getName()}_unedited = (${method.getType()}) ${toHex(method.address)};\n`;
+                declarations += method.generateDefinition('_unedited');
             }
         }
 
diff --git a/src/vtable.ts b/src/vtable.ts
index 2c6b777..fee31e2 100644
--- a/src/vtable.ts
+++ b/src/vtable.ts
@@ -130,6 +130,7 @@ export class VTable {
                 if (info) {
                     const type = `${info.getType()} *`;
                     out += `extern ${type}${info.getName()}_vtable_addr;\n`;
+                    out += `extern ${info.generateDefinition('_non_virtual')}`;
                     out += info.generateNewMethodTest(directParent, '*', '_vtable_addr');
                 }
             }
@@ -166,6 +167,8 @@ export class VTable {
                     const type = `${info.getType()} *`;
                     init += `${INDENT}${info.getName()}_vtable_addr = (${type}) ${toHex(vtableAddress)};\n`;
                     declarations += `${type}${info.getName()}_vtable_addr;\n`;
+                    init += `${INDENT}${info.getName()}_non_virtual = *${info.getName()}_vtable_addr;\n`;
+                    declarations += info.generateDefinition('_non_virtual');
                 }
             }
         }
diff --git a/syntax-highlighting/def.nanorc b/syntax-highlighting/def.nanorc
index 926abe1..6f65e84 100644
--- a/syntax-highlighting/def.nanorc
+++ b/syntax-highlighting/def.nanorc
@@ -1,17 +1,34 @@
 syntax def "\.def$"
 comment "//"
 
+# Mistakes
+# Missing semicolon
+color red "[^;]$"
+# Missing type
+color red "^(((static|virtual)-)?method|property|static-property(-array)?) [a-zA-Z_][a-zA-Z0-9_]* ?(\(|=)"
+# Missing prefix
+color red "^[^ ]+"
+# Missing vtable
+color red "^(vtable(-size|-destructor-offset))? .+$"
+
+# Reset
+color normal "(\(|\))"
+
 # Commands
-color magenta "\<(extends|size|vtable(-size|-destructor-offset)?|property|static-property|((static|virtual)-)?method|constructor)\>"
+color magenta "^(extends|size|vtable(-size|-destructor-offset)?|property|static-property|((static|virtual)-)?method|constructor)\>"
 
 # Types
-color green "\<(char|uchar|short|ushort|int|uint|float|bool|void|std::(string|vector|map))\>"
+color green "\<((u?(char|short|int))|float|bool|void|std::(string|vector|map))\>"
 
 # Numbers
 color yellow "0x[a-f0-9]+"
+# Non-hex numbers
+color red " [0-9][a-f0-9]+;"
 
 # Comments
 color brightblue "//.*"
 
+# Whitespace.
+color normal "[[:space:]]+"
 # Trailing whitespace.
 color ,green "[[:space:]]+$"