Added CObjError, cosmoV_throw(), pcall(), and cosmoV_printError()

Errors are now handled very differently, parser errors and VM errors are now treated the same.
When cosmoV_error is called, cosmoV_throw is also called, which formats the error object and sets the panic state.
state->error now points to the latest CObjError when state->panic is true. To get a nice formatted Objection message, use
cosmoV_printError() and pass the state->error. pcall() was added to the standard base library. When called, the first argument
passed is called with the subsequent arguments given. If the call completed successfully, `true`,`nil` is returned. However
when an error occurs during the call, `false`,`<error>` is returned. Simply print the `<error>` to retrieve the error string.

src/cbaselib.c

@@ -21,7 +21,7 @@ int cosmoB_assert(CState *state, int nargs, CValue *args) {
     }
 
     if (!IS_BOOLEAN(args[0])) {
-        cosmoV_error(state, "assert() expected (<boolean>), got (%s!)", cosmoV_typeStr(args[0]));
+        cosmoV_typeError(state, "assert()", "<boolean>", "%s", cosmoV_typeStr(args[0]));
         return 0;
     }
 
@@ -43,13 +43,28 @@ int cosmoB_type(CState *state, int nargs, CValue *args) {
     return 1; // 1 return value, the type string :D
 }
 
+int cosmoB_pcall(CState *state, int nargs, CValue *args) {
+    if (nargs < 1) {
+        cosmoV_error(state, "pcall() expected at least 1 argument!");
+        return 0;
+    }
+
+    // call the passed callable
+    COSMOVMRESULT res = cosmoV_pcall(state, nargs-1, 1);
+
+    // insert false before the result
+    cosmo_insert(state, 0, cosmoV_newBoolean(res == COSMOVM_OK));
+    cosmoV_printStack(state);
+    return 2;
+}
+
 // ================================================================ [STRING.*] ================================================================
 
 // string.sub
 int cosmoB_sSub(CState *state, int nargs, CValue *args) {
     if (nargs == 2) {
         if (!IS_STRING(args[0]) || !IS_NUMBER(args[1])) {
-            cosmoV_error(state, "string.sub() expected (<string>, <number>), got (%s, %s)!", cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
+            cosmoV_typeError(state, "string.sub()", "<string>, <number>", "%s, %s", cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
             return 0;
         }
 
@@ -58,14 +73,14 @@ int cosmoB_sSub(CState *state, int nargs, CValue *args) {
 
         // make sure we stay within memory
         if (indx < 0 || indx >= str->length) {
-            cosmoV_error(state, "string.sub() Expected index to be 0-%d, got %d!", str->length, indx);
+            cosmoV_error(state, "string.sub() expected index to be 0-%d, got %d!", str->length, indx);
             return 0;
         }
 
         cosmoV_pushLString(state, str->str + ((int)indx), str->length - ((int)indx));
     } else if (nargs == 3) {
         if (!IS_STRING(args[0]) || !IS_NUMBER(args[1]) || !IS_NUMBER(args[2])) {
-            cosmoV_error(state, "string.sub() expected (<string>, <number>, <number>), got (%s, %s, %s)!", cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]), cosmoV_typeStr(args[2]));
+            cosmoV_typeError(state, "string.sub()", "<string>, <number>, <number>", "%s, %s, %s", cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]), cosmoV_typeStr(args[2]));
             return 0;
         }
 
@@ -75,7 +90,7 @@ int cosmoB_sSub(CState *state, int nargs, CValue *args) {
 
         // make sure we stay within memory
         if (indx + length < 0 || indx + length >= str->length || indx < 0 || indx >= str->length) {
-            cosmoV_error(state, "string.sub() Expected subbed string goes out of bounds, max length is %d!", str->length);
+            cosmoV_error(state, "string.sub() expected subbed string goes out of bounds, max length is %d!", str->length);
             return 0;
         }
 
@@ -101,6 +116,10 @@ void cosmoB_loadLibrary(CState *state) {
     cosmoV_pushString(state, "type");
     cosmoV_pushCFunction(state, cosmoB_type);
 
+    // pcall
+    cosmoV_pushString(state, "pcall");
+    cosmoV_pushCFunction(state, cosmoB_pcall);
+
     // string.
     cosmoV_pushString(state, "string");
 
@@ -112,7 +131,7 @@ void cosmoB_loadLibrary(CState *state) {
     // string.
 
     // register these all to the global table
-    cosmoV_register(state, 4);
+    cosmoV_register(state, 5);
 }
 
 // ================================================================ [DEBUG] ================================================================

src/cbaselib.h

@@ -8,5 +8,9 @@ COSMO_API void cosmoB_loadDebug(CState *state);
 COSMO_API int cosmoB_print(CState *state, int nargs, CValue *args);
 COSMO_API int cosmoB_assert(CState *state, int nargs, CValue *args);
 COSMO_API int cosmoB_type(CState *state, int nargs, CValue *args);
+COSMO_API int cosmoB_pcall(CState *state, int nargs, CValue *args);
+
+#define cosmoV_typeError(state, name, expectedTypes, formatStr, ...) \
+        cosmoV_error(state, name " expected (" expectedTypes "), got (" formatStr ")!", __VA_ARGS__);
 
 #endif

src/clex.c

@@ -205,6 +205,7 @@ CToken parseString(CLexState *state) {
                     case 'r': case 'n': appendBuffer(state, '\n'); break;
                     case 't': appendBuffer(state, '\t'); break;
                     case '\\': appendBuffer(state, '\\'); break;
+                    case '"': appendBuffer(state, '"'); break;
                     default: {
                         if (isNumerical(peek(state))) {
                             char *numStart = state->currentChar;

src/cmem.c

@@ -120,6 +120,16 @@ void blackenObject(CState *state, CObj *obj) {
             markObject(state, (CObj*)method->obj);
             break;
         }
+        case COBJ_ERROR: {
+            CObjError *err = (CObjError*)obj;
+            markValue(state, err->err);
+
+            // mark callframes
+            for (int i = 0; i < err->frameCount; i++) 
+                markObject(state, (CObj*)err->frames[i].closure);
+
+            break;
+        }
         case COBJ_CLOSURE: {
             CObjClosure *closure = (CObjClosure*)obj;
             markObject(state, (CObj*)closure->function);
@@ -232,8 +242,10 @@ void markRoots(CState *state) {
     // mark the user defined roots
     markUserRoots(state);
 
-    // mark our proto object
+    // mark other misc. internally reserved objects
     markObject(state, (CObj*)state->protoObj);
+    markObject(state, (CObj*)state->error);
+
     traceGrays(state);
 }
 

src/cobj.c

@@ -3,6 +3,7 @@
 #include "cobj.h"
 #include "cmem.h"
 #include "cvm.h"
+#include "clex.h"
 
 #include <string.h>
 
@@ -75,6 +76,12 @@ void cosmoO_free(CState *state, CObj* obj) {
             cosmoM_free(state, CObjMethod, obj); // we don't own the closure or the object so /shrug
             break;
         }
+        case COBJ_ERROR: {
+            CObjError *err = (CObjError*)obj;
+            cosmoM_freearray(state, CCallFrame, err->frames, err->frameCount);
+            cosmoM_free(state, CObjError, obj);
+            break;
+        }
         case COBJ_CLOSURE: {
             CObjClosure* closure = (CObjClosure*)obj;
             cosmoM_freearray(state, CObjUpval*, closure->upvalues, closure->upvalueCount);
@@ -142,6 +149,21 @@ CObjCFunction *cosmoO_newCFunction(CState *state, CosmoCFunction func) {
     return cfunc;
 }
 
+CObjError *cosmoO_newError(CState *state, CValue err) {
+    CObjError *cerror = (CObjError*)cosmoO_allocateBase(state, sizeof(CObjError), COBJ_ERROR);
+    cerror->err = err;
+    cerror->frameCount = state->frameCount;
+
+    // allocate the callframe
+    cerror->frames = cosmoM_xmalloc(state, sizeof(CCallFrame) * cerror->frameCount);
+
+    // clone the call frame
+    for (int i = 0; i < state->frameCount; i++)
+        cerror->frames[i] = state->callFrame[i];
+    
+    return cerror;
+}
+
 CObjMethod *cosmoO_newCMethod(CState *state, CObjCFunction *func, CObjObject *obj) {
     CObjMethod *method = (CObjMethod*)cosmoO_allocateBase(state, sizeof(CObjMethod), COBJ_METHOD);
     method->func = cosmoV_newObj(func);
@@ -251,6 +273,11 @@ CObjString *cosmoO_pushVFString(CState *state, const char *format, va_list args)
                 cosmoV_pushString(state, va_arg(args, char *));
                 break;
             }
+            case 't': { // CToken *
+                CToken *token = va_arg(args, CToken *);
+                cosmoV_pushLString(state, token->start, token->length);
+                break;
+            }
             default: {
                 char temp[2];
                 temp[0] = '%';
@@ -420,6 +447,10 @@ CObjString *cosmoO_toString(CState *state, CObj *obj) {
                 return cosmoO_copyString(state, buf, sz);
             }
         }
+        case COBJ_ERROR: {
+            CObjError *err = (CObjError*)obj;
+            return cosmoV_toString(state, err->err);
+        }
         case COBJ_DICT: {
             char buf[64];
             int sz = sprintf(buf, "<dict> %p", (void*)obj) + 1; // +1 for the null character

src/cobj.h

@@ -8,6 +8,7 @@
 #include "ctable.h"
 
 typedef struct CState CState;
+typedef struct CCallFrame CCallFrame;
 typedef uint32_t cosmo_Flag;
 
 typedef enum {
@@ -16,6 +17,7 @@ typedef enum {
     COBJ_DICT, // dictionary
     COBJ_FUNCTION,
     COBJ_CFUNCTION,
+    COBJ_ERROR,
     // internal use
     COBJ_METHOD,
     COBJ_CLOSURE,
@@ -43,6 +45,15 @@ typedef struct CObjString {
     uint32_t hash; // for hashtable lookup
 } CObjString;
 
+typedef struct CObjError {
+    CommonHeader; // "is a" CObj
+    bool parserError; // if true, cosmoV_printError will format the error to the lexer
+    int frameCount;
+    int line; // reserved for parser errors
+    CValue err; // error string
+    CCallFrame *frames;
+} CObjError;
+
 typedef struct CObjObject {
     CommonHeader; // "is a" CObj
     cosmo_Flag istringFlags; // enables us to have a much faster lookup for reserved IStrings (like __init, __index, etc.)
@@ -129,6 +140,7 @@ CObjObject *cosmoO_newObject(CState *state);
 CObjDict *cosmoO_newDictionary(CState *state);
 CObjFunction *cosmoO_newFunction(CState *state);
 CObjCFunction *cosmoO_newCFunction(CState *state, CosmoCFunction func);
+CObjError *cosmoO_newError(CState *state, CValue err);
 CObjMethod *cosmoO_newMethod(CState *state, CObjClosure *func, CObjObject *obj);
 CObjMethod *cosmoO_newCMethod(CState *state,  CObjCFunction *func, CObjObject *obj);
 CObjClosure *cosmoO_newClosure(CState *state, CObjFunction *func);
@@ -161,6 +173,7 @@ CObjString *cosmoO_allocateString(CState *state, const char *str, size_t sz, uin
     '%d' - decimal numbers  [int]
     '%f' - floating point   [double]
     '%s' - strings          [const char*]
+    '%t' - cosmo tokens     [CToken *]
 */
 CObjString *cosmoO_pushVFString(CState *state, const char *format, va_list args);
 

src/cosmo.h

@@ -36,6 +36,7 @@ typedef struct CObjUpval CObjUpval;
 typedef struct CObjFunction CObjFunction;
 typedef struct CObjCFunction CObjCFunction;
 typedef struct CObjMethod CObjMethod;
+typedef struct CObjError CObjError;
 typedef struct CObjObject CObjObject;
 typedef struct CObjClosure CObjClosure;
 

src/cparse.c

@@ -140,29 +140,41 @@ static void freeParseState(CParseState *pstate) {
     cosmoL_freeLexState(pstate->state, pstate->lex);
 }
 
-static void errorAt(CParseState *pstate, CToken *token, const char * msg) {
+static void errorAt(CParseState *pstate, CToken *token, const char *format, va_list args) {
     if (pstate->hadError)
         return;
 
-    fprintf(stderr, "[line %d] Objection", token->line);
 
     if (token->type == TOKEN_EOF) {
-        fprintf(stderr, " at end");
+        cosmoV_pushString(pstate->state, "At end: ");
     } else if (!(token->type == TOKEN_ERROR)) {
-        fprintf(stderr, " at '%.*s'", token->length, token->start);
+        cosmoV_pushFString(pstate->state, "At '%t'", token); // this is why the '%t' exist in cosmoO_pushFString lol
     }
 
-    printf(": \n\t%s\n", msg);
+    cosmoO_pushVFString(pstate->state, format, args);
+
+    cosmoV_concat(pstate->state, 2); // concats the two strings together
+
+    CObjError *err = cosmoV_throw(pstate->state);
+    err->line = token->line;
+    err->parserError = true;
+
     pstate->hadError = true;
     pstate->panic = true;
 }
 
-static void errorAtCurrent(CParseState *pstate, const char *msg) {
-    errorAt(pstate, &pstate->current, msg);
+static void errorAtCurrent(CParseState *pstate, const char *format, ...) {
+    va_list args;
+    va_start(args, format);
+    errorAt(pstate, &pstate->current, format, args);
+    va_end(args);
 }
 
-static void error(CParseState *pstate, const char *msg) {
-    errorAt(pstate, &pstate->previous, msg);
+static void error(CParseState *pstate, const char *format, ...) {
+    va_list args;
+    va_start(args, format);
+    errorAt(pstate, &pstate->previous, format, args);
+    va_end(args);
 }
 
 static void advance(CParseState *pstate) {

src/cstate.c

@@ -31,7 +31,9 @@ CState *cosmoV_newState() {
     state->top = state->stack;
     state->frameCount = 0;
     state->openUpvalues = NULL;
+
     state->protoObj = NULL;
+    state->error = NULL;
 
     cosmoT_initTable(state, &state->strings, 8); // init string table
     cosmoT_initTable(state, &state->globals, 8); // init global table

src/cstate.h

@@ -37,6 +37,7 @@ typedef struct CState {
     int frameCount;
 
     CObjObject *protoObj; // start met obj for all objects (NULL by default)
+    CObjError *error; // NULL, unless panic is true
     CObj *objects; // tracks all of our allocated objects
     CObj *userRoots; // user definable roots, this holds CObjs that should be considered "roots", lets the VM know you are holding a reference to a CObj in your code
     ArrayCObj grayStack; // keeps track of which objects *haven't yet* been traversed in our GC, but *have been* found

src/cvm.c

@@ -15,43 +15,78 @@ COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...) {
     va_end(args);
 }
 
-void cosmoV_error(CState *state, const char *format, ...) {
-    if (state->panic)
-        return;
-    state->panic = true;
+// inserts val at state->top - indx - 1, moving everything else up
+COSMO_API void cosmo_insert(CState *state, int indx, CValue val) {
+    StkPtr tmp = cosmoV_getTop(state, indx);
 
+    // moves everything up
+    for (StkPtr i = state->top; i > tmp; i--)
+        *i = *(i-1);
+    
+    *tmp = val;
+    state->top++;
+}
+
+void cosmoV_printError(CState *state, CObjError *err) {
     // print stack trace
-    for (int i = 0; i < state->frameCount; i++) {
-        CCallFrame *frame = &state->callFrame[i];
+    for (int i = 0; i < err->frameCount; i++) {
+        CCallFrame *frame = &err->frames[i];
         CObjFunction *function = frame->closure->function;
         CChunk *chunk = &function->chunk;
 
         int line = chunk->lineInfo[frame->pc - chunk->buf - 1];
 
-        if (i == state->frameCount - 1) { // it's the last call frame, prepare for the objection to be printed
+        if (i == err->frameCount - 1 && !err->parserError) // it's the last call frame (and not a parser error), prepare for the objection to be printed
             fprintf(stderr, "Objection in %.*s on [line %d] in ", function->module->length, function->module->str, line);
-            if (function->name == NULL) { // unnamed chunk
-                fprintf(stderr, "%s\n\t", UNNAMEDCHUNK);
-            } else {
-                fprintf(stderr, "%.*s()\n\t", function->name->length, function->name->str);
-            }
-        } else {
+        else
             fprintf(stderr, "[line %d] in ", line);
-            if (function->name == NULL) { // unnamed chunk
-                fprintf(stderr, "%s\n", UNNAMEDCHUNK);
-            } else {
-                fprintf(stderr, "%.*s()\n", function->name->length, function->name->str);
-            }
+        
+        if (function->name == NULL) { // unnamed chunk
+            fprintf(stderr, "%s\n", UNNAMEDCHUNK);
+        } else {
+            fprintf(stderr, "%.*s()\n", function->name->length, function->name->str);
         }
     }
 
+    if (err->parserError)
+        fprintf(stderr, "Objection while parsing on [line %d]\n", err->line);
+
+    // finally, print the error message
+    CObjString *errString = cosmoV_toString(state, err->err);
+    printf("\t%.*s\n", errString->length, errString->str);
+}
+
+/*
+    takes value on top of the stack and wraps an CObjError around it, state->error is set to that value
+    the value on the stack is *expected* to be a string, but not required, so
+    yes, this means you could throw a nil value if you really wanted too..
+*/
+CObjError* cosmoV_throw(CState *state) {
+    StkPtr temp = cosmoV_getTop(state, 0);
+
+    CObjError *error = cosmoO_newError(state, *temp);
+    state->error = error;
+    state->panic = true;
+
+    cosmoV_pop(state); // pops thrown value off the stack
+    return error;
+}
+
+void cosmoV_error(CState *state, const char *format, ...) {
+    if (state->panic)
+        return;
+    
+    // i set panic before calling cosmoO_pushVFString, since that can also call cosmoV_error
+    state->panic = true;
+
+    // format the error string and push it onto the stack
     va_list args;
     va_start(args, format);
-    CObjString *errString = cosmoO_pushVFString(state, format, args);
+    cosmoO_pushVFString(state, format, args);
     va_end(args);
 
-    printf("%.*s\n", errString->length, errString->str);
-    //cosmoV_printStack(state);
+    // throw the error onto the state
+    cosmoV_throw(state);
 }
 
 CObjUpval *captureUpvalue(CState *state, CValue *local) {
@@ -144,7 +179,7 @@ bool invokeMethod(CState* state, CObjObject *obj, CValue func, int args, int nre
     calls a native C Function with # args on the stack, nresults are pushed onto the stack upon return.
 
     returns:
-        false: state paniced during C Function, stack is preserved so that the error is left on the stack
+        false: state paniced during C Function, error is at state->error
         true: state->top is moved to base + offset + nresults, with nresults pushed onto the stack from base + offset
 */
 static bool callCFunction(CState *state, CosmoCFunction cfunc, int args, int nresults, int offset) {
@@ -155,9 +190,6 @@ static bool callCFunction(CState *state, CosmoCFunction cfunc, int args, int nre
     int nres = cfunc(state, args, savedBase + 1);
     cosmoM_unfreezeGC(state);
 
-    // if the state paniced during the c function, return false and leave the stack preserved (so the error is left on the stack)
-    if (state->panic)
-        return false;
 
     // caller function wasn't expecting this many return values, cap it
     if (nres > nresults)
@@ -168,6 +200,10 @@ static bool callCFunction(CState *state, CosmoCFunction cfunc, int args, int nre
 
     state->top = savedBase + offset; // set stack
 
+    // if the state paniced during the c function, return false
+    if (state->panic)
+        return false;
+    
     // push the return value back onto the stack
     memmove(state->top, results, sizeof(CValue) * nres); // copies the return values to the top of the stack
     state->top += nres; // and make sure to move state->top to match
@@ -183,7 +219,7 @@ static bool callCFunction(CState *state, CosmoCFunction cfunc, int args, int nre
     calls a raw closure object with # args on the stack, nresults are pushed onto the stack upon return.
     
     returns:
-        false: state paniced, stack is preserved so that the error is left on the stack
+        false: state paniced, error is at state->error
         true: stack->top is moved to base + offset + nresults, with nresults pushed onto the stack from base + offset
 */
 static bool rawCall(CState *state, CObjClosure *closure, int args, int nresults, int offset) {
@@ -215,8 +251,6 @@ static bool rawCall(CState *state, CObjClosure *closure, int args, int nresults,
 
     // execute
     int nres = cosmoV_execute(state);
-    if (nres == -1) // panic state
-        return false;
 
     if (nres > nresults) // caller function wasn't expecting this many return values, cap it
         nres = nresults;
@@ -226,6 +260,9 @@ static bool rawCall(CState *state, CObjClosure *closure, int args, int nresults,
 
     // pop the callframe and return results :)
     popCallFrame(state, offset);
+    
+    if (state->panic) // panic state
+        return false;
 
     // push the return values back onto the stack
     memmove(state->top, results, sizeof(CValue) * nres); // copies the return values to the top of the stack
@@ -247,6 +284,8 @@ bool callCValue(CState *state, CValue func, int args, int nresults, int offset)
     switch (cosmoV_readObj(func)->type) {
         case COBJ_CLOSURE: 
             return rawCall(state, cosmoV_readClosure(func), args, nresults, offset);
+        case COBJ_CFUNCTION:
+            return callCFunction(state, cosmoV_readCFunction(func), args, nresults, offset);
         case COBJ_METHOD: {
             CObjMethod *method = (CObjMethod*)cosmoV_readObj(func);
             return invokeMethod(state, method->obj, method->func, args, nresults, offset + 1);
@@ -277,8 +316,6 @@ bool callCValue(CState *state, CValue func, int args, int nresults, int offset)
             }
             break;
         }
-        case COBJ_CFUNCTION:
-            return callCFunction(state, cosmoV_readCFunction(func), args, nresults, offset);
         default: 
             cosmoV_error(state, "Cannot call non-function value %s!", cosmoV_typeStr(func));
             return false;
@@ -295,31 +332,20 @@ bool invokeMethod(CState* state, CObjObject *obj, CValue func, int args, int nre
     return callCValue(state, func, args+1, nresults, offset);
 }
 
-// wraps cosmoV_call in a protected state, error string will be pushed onto the stack if function call failed, else return values are passed
+// wraps cosmoV_call in a protected state, CObjError will be pushed onto the stack if function call failed, else return values are passed
 COSMOVMRESULT cosmoV_pcall(CState *state, int args, int nresults) {
     StkPtr base = cosmoV_getTop(state, args);
 
-    COSMOVMRESULT res = cosmoV_call(state, args, nresults);
-
-    if (res != COSMOVM_OK) {
+    if (!callCValue(state, *base, args, nresults, 0)) {
         // restore panic state
         state->panic = false;
+        state->error = NULL;
 
-        // error is on the stack, grab it
-        StkPtr err = cosmoV_getTop(state, 0);
-        state->top = base;
-
-        if (nresults > 0) {
-            cosmoV_pushValue(state, *err);
-
-            // push the nils to fill up the expected return values
-            for (int i = 0; i < nresults - 1; i++) { // -1 since the we already pushed the important value
-                cosmoV_pushValue(state, cosmoV_newNil());
-            }
-        }
+        cosmoV_pushValue(state, cosmoV_newObj(state->error));
+        return COSMOVM_RUNTIME_ERR;
     }
 
-    return res;
+    return COSMOVM_OK;
 }
 
 /*
@@ -327,7 +353,7 @@ COSMOVMRESULT cosmoV_pcall(CState *state, int args, int nresults) {
 
     returns:
         COSMOVM_OK: callable object exited normally
-        COSMOVM_RUNTIME_ERR: an error occurred, the error will be at the top of the stack (the rest of the stack is junk)
+        COSMOVM_RUNTIME_ERR: an error occurred, grab the error from state->error
 */
 COSMOVMRESULT cosmoV_call(CState *state, int args, int nresults) {
     StkPtr val = cosmoV_getTop(state, args); // function will always be right above the args

src/cvm.h

@@ -14,12 +14,16 @@ typedef enum {
 
 // args = # of pass parameters, nresults = # of expected results
 COSMO_API COSMOVMRESULT cosmoV_call(CState *state, int args, int nresults);
+COSMO_API COSMOVMRESULT cosmoV_pcall(CState *state, int args, int nresults);
 COSMO_API void cosmoV_makeObject(CState *state, int pairs);
 COSMO_API void cosmoV_makeDictionary(CState *state, int pairs);
 COSMO_API bool cosmoV_getObject(CState *state, CObjObject *object, CValue key, CValue *val);
 COSMO_API void cosmoV_concat(CState *state, int vals);
 COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...);
+COSMO_API void cosmoV_printError(CState *state, CObjError *err);
+COSMO_API CObjError* cosmoV_throw(CState *state);
 COSMO_API void cosmoV_error(CState *state, const char *format, ...);
+COSMO_API void cosmo_insert(CState *state, int indx, CValue val);
 
 // nice to have wrappers
 

src/main.c

@@ -40,8 +40,12 @@ static void interpret(CState *state, const char *script, const char *mod) {
         COSMOVMRESULT res = cosmoV_call(state, 0, 0); // 0 args being passed, 0 results expected
 
         if (res == COSMOVM_RUNTIME_ERR)
-            state->panic = false; // so our repl isn't broken
+            cosmoV_printError(state, state->error);
+    } else {
+        cosmoV_printError(state, state->error);
     }
+
+    state->panic = false; // so our repl isn't broken
 }
 
 static void repl() {