diff --git a/source/compiler.c b/source/compiler.c
index e1ba003..3b26106 100644
--- a/source/compiler.c
+++ b/source/compiler.c
@@ -2,6 +2,8 @@
 
 #include "memory.h"
 
+#include <stdio.h>
+
 void initCompiler(Compiler* compiler) {
 	initLiteralArray(&compiler->literalCache);
 	compiler->bytecode = NULL;
@@ -30,6 +32,11 @@ void writeCompiler(Compiler* compiler, Node* node) {
 	//determine node type
 	switch(node->type) {
 		//TODO: more types, like variables, etc.
+		case NODE_ERROR: {
+			printf("[internal] NODE_ERROR encountered in writeCompiler()");
+			compiler->bytecode[compiler->count++] = OP_EOF; //1 byte
+		}
+		break;
 
 		case NODE_LITERAL: {
 			//ensure the literal is in the cache
@@ -83,19 +90,19 @@ void freeCompiler(Compiler* compiler) {
 	compiler->count = 0;
 }
 
-static void emitByte(char** collationPtr, int* capacityPtr, int* countPtr, unsigned char byte) {
+static void emitByte(unsigned char** collationPtr, int* capacityPtr, int* countPtr, unsigned char byte) {
 	//grow the array
 	if (*countPtr + 1 > *capacityPtr) {
 		int oldCapacity = *capacityPtr;
 		*capacityPtr = GROW_CAPACITY(*capacityPtr);
-		*collationPtr = GROW_ARRAY(char, *collationPtr, oldCapacity, *capacityPtr);
+		*collationPtr = GROW_ARRAY(unsigned char, *collationPtr, oldCapacity, *capacityPtr);
 	}
 
 	//append to the collation
 	(*collationPtr)[(*countPtr)++] = byte;
 }
 
-static void emitShort(char** collationPtr, int* capacityPtr, int* countPtr, unsigned short bytes) {
+static void emitShort(unsigned char** collationPtr, int* capacityPtr, int* countPtr, unsigned short bytes) {
 	char* ptr = (char*)&bytes;
 
 	emitByte(collationPtr, capacityPtr, countPtr, *ptr);
@@ -103,7 +110,7 @@ static void emitShort(char** collationPtr, int* capacityPtr, int* countPtr, unsi
 	emitByte(collationPtr, capacityPtr, countPtr, *ptr);
 }
 
-static void emitInt(char** collationPtr, int* capacityPtr, int* countPtr, int bytes) {
+static void emitInt(unsigned char** collationPtr, int* capacityPtr, int* countPtr, int bytes) {
 	char* ptr = (char*)&bytes;
 
 	emitByte(collationPtr, capacityPtr, countPtr, *ptr);
@@ -115,7 +122,7 @@ static void emitInt(char** collationPtr, int* capacityPtr, int* countPtr, int by
 	emitByte(collationPtr, capacityPtr, countPtr, *ptr);
 }
 
-static void emitFloat(char** collationPtr, int* capacityPtr, int* countPtr, float bytes) {
+static void emitFloat(unsigned char** collationPtr, int* capacityPtr, int* countPtr, float bytes) {
 	char* ptr = (char*)&bytes;
 
 	emitByte(collationPtr, capacityPtr, countPtr, *ptr);
@@ -128,10 +135,10 @@ static void emitFloat(char** collationPtr, int* capacityPtr, int* countPtr, floa
 }
 
 //return the result
-char* collateCompiler(Compiler* compiler, int* size) {
+unsigned char* collateCompiler(Compiler* compiler, int* size) {
 	int capacity = GROW_CAPACITY(0);
 	int count = 0;
-	char* collation = ALLOCATE(char, capacity);
+	unsigned char* collation = ALLOCATE(unsigned char, capacity);
 
 	//embed the header with version information
 	emitByte(&collation, &capacity, &count, TOY_VERSION_MAJOR);
@@ -142,7 +149,7 @@ char* collateCompiler(Compiler* compiler, int* size) {
 	if (strlen(TOY_VERSION_BUILD) + count + 1 > capacity) {
 		int oldCapacity = capacity;
 		capacity = strlen(TOY_VERSION_BUILD) + count + 1; //full header size
-		collation = GROW_ARRAY(char, collation, oldCapacity, capacity);
+		collation = GROW_ARRAY(unsigned char, collation, oldCapacity, capacity);
 	}
 
 	memcpy(&collation[count], TOY_VERSION_BUILD, strlen(TOY_VERSION_BUILD));
@@ -208,7 +215,7 @@ char* collateCompiler(Compiler* compiler, int* size) {
 	emitByte(&collation, &capacity, &count, OP_EOF); //terminate bytecode
 
 	//finalize
-	SHRINK_ARRAY(char, collation, capacity, count);
+	SHRINK_ARRAY(unsigned char, collation, capacity, count);
 
 	*size = count;
 
diff --git a/source/compiler.h b/source/compiler.h
index c186453..3fc43e0 100644
--- a/source/compiler.h
+++ b/source/compiler.h
@@ -18,4 +18,4 @@ void writeCompiler(Compiler* compiler, Node* node);
 void freeCompiler(Compiler* compiler);
 
 //embed the header with version information, data section, code section, etc.
-char* collateCompiler(Compiler* compiler, int* size);
+unsigned char* collateCompiler(Compiler* compiler, int* size);
diff --git a/source/interpreter.c b/source/interpreter.c
index 0313ee2..5f6d7de 100644
--- a/source/interpreter.c
+++ b/source/interpreter.c
@@ -70,9 +70,9 @@ static float readFloat(unsigned char* tb, int* count) {
 }
 
 static char* readString(unsigned char* tb, int* count) {
-	char* ret = tb + *count;
-	*count += strlen(ret) + 1; //+1 for null character
-	return ret;
+	unsigned char* ret = tb + *count;
+	*count += strlen((char*)ret) + 1; //+1 for null character
+	return (char*)ret;
 }
 
 static void consumeByte(unsigned char byte, unsigned char* tb, int* count) {
@@ -194,6 +194,9 @@ static bool execArithmetic(Interpreter* interpreter, Opcode opcode) {
 				pushLiteralArray(&interpreter->stack, TO_INTEGER_LITERAL( AS_INTEGER(lhs) % AS_INTEGER(rhs) ));
 				return true;
 
+			default:
+				printf("[internal] bad opcode argument passed to execArithmetic()");
+				return false;
 		}
 	}
 
@@ -220,6 +223,10 @@ static bool execArithmetic(Interpreter* interpreter, Opcode opcode) {
 			case OP_DIVISION:
 				pushLiteralArray(&interpreter->stack, TO_FLOAT_LITERAL( AS_FLOAT(lhs) / AS_FLOAT(rhs) ));
 				return true;
+
+			default:
+				printf("[internal] bad opcode argument passed to execArithmetic()");
+				return false;
 		}
 	}
 
diff --git a/source/keyword_types.c b/source/keyword_types.c
index a669a24..1acb8f2 100644
--- a/source/keyword_types.c
+++ b/source/keyword_types.c
@@ -32,7 +32,7 @@ KeywordType keywordTypes[] = {
 	{TOKEN_OF,         "of"},
 	{TOKEN_PRINT,      "print"},
 	{TOKEN_RETURN,     "return"},
-	{TOKEN_USING,      "using"},
+	{TOKEN_TYPE,       "type"},
 	{TOKEN_VAR,        "var"},
 	{TOKEN_WHILE,      "while"},
 
@@ -41,8 +41,8 @@ KeywordType keywordTypes[] = {
 	{TOKEN_LITERAL_FALSE,  "false"},
 
 	//meta tokens
-	{TOKEN_PASS,       "pass"},
-	{TOKEN_ERROR,      "error"},
+	{TOKEN_PASS,       NULL},
+	{TOKEN_ERROR,      NULL},
 
 	{TOKEN_EOF, NULL},
 };
diff --git a/source/makefile b/source/makefile
index 0f2c134..1c78cf0 100644
--- a/source/makefile
+++ b/source/makefile
@@ -1,7 +1,7 @@
 CC=gcc
 
 IDIR =.
-CFLAGS=$(addprefix -I,$(IDIR)) -g # -Wall -W -pedantic
+CFLAGS=$(addprefix -I,$(IDIR)) -g # -Wall -W -pedantic -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
 LIBS=
 
 ODIR=obj
diff --git a/source/node.c b/source/node.c
index 728a22d..044bf38 100644
--- a/source/node.c
+++ b/source/node.c
@@ -11,6 +11,10 @@ void freeNode(Node* node) {
 	}
 
 	switch(node->type) {
+		case NODE_ERROR:
+			//NO-OP
+			break;
+
 		case NODE_LITERAL:
 			freeLiteral(node->atomic.literal);
 			break;
@@ -71,6 +75,10 @@ void emitNodeGrouping(Node** nodeHandle) {
 
 void printNode(Node* node) {
 	switch(node->type) {
+		case NODE_ERROR:
+			printf("error");
+			break;
+
 		case NODE_LITERAL:
 			printf("literal:");
 			printLiteral(node->atomic.literal);
diff --git a/source/parser.c b/source/parser.c
index 99dec9b..2ff9d68 100644
--- a/source/parser.c
+++ b/source/parser.c
@@ -424,6 +424,10 @@ static bool calcStaticBinaryArithmetic(Node** nodeHandle) {
 			case OP_MODULO:
 				result = TO_INTEGER_LITERAL( AS_INTEGER(lhs) % AS_INTEGER(rhs) );
 			break;
+
+			default:
+				printf("[internal] bad opcode argument passed to calcStaticBinaryArithmetic()");
+				return false;
 		}
 	}
 
@@ -450,6 +454,10 @@ static bool calcStaticBinaryArithmetic(Node** nodeHandle) {
 			case OP_DIVISION:
 				result = TO_FLOAT_LITERAL( AS_FLOAT(lhs) / AS_FLOAT(rhs) );
 			break;
+
+			default:
+				printf("[internal] bad opcode argument passed to calcStaticBinaryArithmetic()");
+				return false;
 		}
 	}
 
diff --git a/source/repl_main.c b/source/repl_main.c
index 3194927..5140bb4 100644
--- a/source/repl_main.c
+++ b/source/repl_main.c
@@ -73,7 +73,7 @@ void runString(char* source) {
 
 	//get the bytecode dump
 	int size = 0;
-	char* tb = collateCompiler(&compiler, &size);
+	unsigned char* tb = collateCompiler(&compiler, &size);
 
 	//cleanup
 	freeCompiler(&compiler);
@@ -131,7 +131,7 @@ void repl() {
 		if (!error) {
 			//get the bytecode dump
 			int size = 0;
-			char* tb = collateCompiler(&compiler, &size);
+			unsigned char* tb = collateCompiler(&compiler, &size);
 
 			// for (int i = 0; i < size; i++) {
 			// 	printf("%d ", tb[i]);
diff --git a/source/token_types.h b/source/token_types.h
index 2f04a36..e38b601 100644
--- a/source/token_types.h
+++ b/source/token_types.h
@@ -30,7 +30,7 @@ typedef enum TokenType {
 	TOKEN_OF,
 	TOKEN_PRINT,
 	TOKEN_RETURN,
-	TOKEN_USING,
+	TOKEN_TYPE,
 	TOKEN_VAR,
 	TOKEN_WHILE,