diff --git a/scripts/small.toy b/scripts/small.toy
index 96acd6f..d18ddcb 100644
--- a/scripts/small.toy
+++ b/scripts/small.toy
@@ -1,9 +1,14 @@
 import compound;
 
+fn p(x) {
+	print x;
+};
+
 fn f(acc, k, v) {
-	return acc + v;
+	acc(v);
+	return acc;
 }
 
 var a = [1, 2, 3, 4];
 
-print a.reduce(0, f); //prints "10"
\ No newline at end of file
+a.reduce(p, f); //prints "10"
\ No newline at end of file
diff --git a/source/toy_compiler.c b/source/toy_compiler.c
index f28cef9..335c453 100644
--- a/source/toy_compiler.c
+++ b/source/toy_compiler.c
@@ -15,6 +15,7 @@ void Toy_initCompiler(Toy_Compiler* compiler) {
 	compiler->bytecode = NULL;
 	compiler->capacity = 0;
 	compiler->count = 0;
+	compiler->panic = false;
 }
 
 //separated out, so it can be recursive
@@ -133,6 +134,7 @@ static int writeNodeCompoundToCache(Toy_Compiler* compiler, Toy_ASTNode* node) {
 		index = Toy_pushLiteralArray(&compiler->literalCache, literal);
 		Toy_freeLiteral(literal);
 	}
+
 	else if (node->compound.literalType == TOY_LITERAL_ARRAY) {
 		//ensure each literal value is in the cache, individually
 		for (int i = 0; i < node->compound.count; i++) {
@@ -160,7 +162,7 @@ static int writeNodeCompoundToCache(Toy_Compiler* compiler, Toy_ASTNode* node) {
 				break;
 
 				default:
-					fprintf(stderr, TOY_CC_ERROR "[internal] Unrecognized node type in writeNodeCompoundToCache()" TOY_CC_RESET);
+					fprintf(stderr, TOY_CC_ERROR "[internal] Unrecognized node type in writeNodeCompoundToCache()\n" TOY_CC_RESET);
 					return -1;
 			}
 		}
@@ -172,7 +174,8 @@ static int writeNodeCompoundToCache(Toy_Compiler* compiler, Toy_ASTNode* node) {
 		Toy_freeLiteral(literal);
 	}
 	else {
-		fprintf(stderr, TOY_CC_ERROR "[internal] Unrecognized compound type in writeNodeCompoundToCache()" TOY_CC_RESET);
+		fprintf(stderr, TOY_CC_ERROR "[internal] Unrecognized compound type in writeNodeCompoundToCache()\n" TOY_CC_RESET);
+		return -1;
 	}
 
 	return index;
@@ -333,7 +336,7 @@ static Toy_Opcode Toy_writeCompilerWithJumps(Toy_Compiler* compiler, Toy_ASTNode
 		break;
 
 		case TOY_AST_NODE_TERNARY: {
-			// TODO
+			// TODO: a ?: b;
 
 			//process the condition
 			Toy_Opcode override = Toy_writeCompilerWithJumps(compiler, node->ternary.condition, breakAddressesPtr, continueAddressesPtr, jumpOffsets, rootNode);
@@ -402,6 +405,11 @@ static Toy_Opcode Toy_writeCompilerWithJumps(Toy_Compiler* compiler, Toy_ASTNode
 		case TOY_AST_NODE_COMPOUND: {
 			int index = writeNodeCompoundToCache(compiler, node);
 
+			if (index < 0) {
+				compiler->panic = true;
+				return TOY_OP_EOF;
+			}
+
 			//push the node opcode to the bytecode
 			if (index >= 256) {
 				//push a "long" index
@@ -469,6 +477,11 @@ static Toy_Opcode Toy_writeCompilerWithJumps(Toy_Compiler* compiler, Toy_ASTNode
 				compiler->bytecode[compiler->count++] = (unsigned char)override; //1 byte
 			}
 
+			//adopt the panic state if anything happened
+			if (fnCompiler->panic) {
+				compiler->panic = true;
+			}
+
 			//create the function in the literal cache (by storing the compiler object)
 			Toy_Literal fnLiteral = TOY_TO_FUNCTION_LITERAL(fnCompiler, 0);
 			fnLiteral.type = TOY_LITERAL_FUNCTION_INTERMEDIATE; //NOTE: changing type
@@ -505,6 +518,11 @@ static Toy_Opcode Toy_writeCompilerWithJumps(Toy_Compiler* compiler, Toy_ASTNode
 		case TOY_AST_NODE_FN_COLLECTION: {
 			//embed these in the bytecode...
 			unsigned short index = (unsigned short)writeNodeCollectionToCache(compiler, node);
+			
+			if (index == (unsigned short)-1) {
+				compiler->panic = true;
+				return TOY_OP_EOF;
+			}
 
 			memcpy(compiler->bytecode + compiler->count, &index, sizeof(index));
 			compiler->count += sizeof(unsigned short);
@@ -755,7 +773,7 @@ static Toy_Opcode Toy_writeCompilerWithJumps(Toy_Compiler* compiler, Toy_ASTNode
 
 		case TOY_AST_NODE_BREAK: {
 			if (!breakAddressesPtr) {
-				fprintf(stderr, TOY_CC_ERROR "TOY_CC_ERROR: Can't place a break statement here\n" TOY_CC_RESET);
+				fprintf(stderr, TOY_CC_ERROR "[internal] Can't place a break statement here\n" TOY_CC_RESET);
 				break;
 			}
 
@@ -773,7 +791,7 @@ static Toy_Opcode Toy_writeCompilerWithJumps(Toy_Compiler* compiler, Toy_ASTNode
 
 		case TOY_AST_NODE_CONTINUE: {
 			if (!continueAddressesPtr) {
-				fprintf(stderr, TOY_CC_ERROR "TOY_CC_ERROR: Can't place a continue statement here\n" TOY_CC_RESET);
+				fprintf(stderr, TOY_CC_ERROR "[internal] Can't place a continue statement here\n" TOY_CC_RESET);
 				break;
 			}
 
@@ -1008,6 +1026,11 @@ static void emitFloat(unsigned char** collationPtr, int* capacityPtr, int* count
 
 //return the result
 static unsigned char* collateCompilerHeaderOpt(Toy_Compiler* compiler, int* size, bool embedHeader) {
+	if (compiler->panic) {
+		fprintf(stderr, TOY_CC_ERROR "[internal] Can't collate a panicked compiler\n" TOY_CC_RESET);
+		return NULL;
+	}
+
 	int capacity = TOY_GROW_CAPACITY(0);
 	int count = 0;
 	unsigned char* collation = TOY_ALLOCATE(unsigned char, capacity);
diff --git a/source/toy_compiler.h b/source/toy_compiler.h
index c206d5b..08b8d44 100644
--- a/source/toy_compiler.h
+++ b/source/toy_compiler.h
@@ -11,6 +11,7 @@ typedef struct Toy_Compiler {
 	unsigned char* bytecode;
 	int capacity;
 	int count;
+	bool panic;
 } Toy_Compiler;
 
 TOY_API void Toy_initCompiler(Toy_Compiler* compiler);