diff --git a/bin/test.slime b/bin/test.slime
index c8c55d5..644d5de 100644
--- a/bin/test.slime
+++ b/bin/test.slime
@@ -12,4 +12,6 @@
 (defun ! (n)
   (if (< n 2)
       1
-    (* n (! (- 1 n)))))
+    (* n (! (- n 1)))))
+
+(erros "alskdj")
\ No newline at end of file
diff --git a/src/ast.c b/src/ast.c
index 559c169..11e6787 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -237,22 +237,28 @@ typedef struct {
     Ast_Node_Array_List* keyword_values;
 } Parsed_Arguments;
 
-Ast_Node* create_ast_node_nil() {
+Ast_Node* create_ast_node() {
     Ast_Node* node = new(Ast_Node);
+    node->sourceCodeLocation = nullptr;
+    return node;
+}
+
+Ast_Node* create_ast_node_nil() {
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_Nil;
     node->value.pair = nullptr;
     return node;
 }
 
 Ast_Node* create_ast_node_t() {
-    Ast_Node* node = new(Ast_Node);
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_T;
     node->value.pair = nullptr;
     return node;
 }
 
 Ast_Node* create_ast_node_number(double number) {
-    Ast_Node* node = new(Ast_Node);
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_Number;
     node->value.number = new(Number);
     node->value.number->value = number;
@@ -260,7 +266,7 @@ Ast_Node* create_ast_node_number(double number) {
 }
 
 Ast_Node* create_ast_node_string(char* str, int length) {
-    Ast_Node* node = new(Ast_Node);
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_String;
     node->value.string = new(String);
     node->value.string->value = str;
@@ -269,7 +275,7 @@ Ast_Node* create_ast_node_string(char* str, int length) {
 }
 
 Ast_Node* create_ast_node_symbol(char* identifier) {
-    Ast_Node* node = new(Ast_Node);
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_Symbol;
     node->value.symbol = new(Symbol);
     node->value.symbol->identifier = identifier;
@@ -277,7 +283,7 @@ Ast_Node* create_ast_node_symbol(char* identifier) {
 }
 
 Ast_Node* create_ast_node_keyword(char* keyword) {
-    Ast_Node* node = new(Ast_Node);
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_Keyword;
     node->value.keyword = new(Keyword);
     node->value.keyword->identifier = keyword;
@@ -326,7 +332,7 @@ Ast_Node* create_ast_node_built_in_function(char* name) {
     else if (string_equal(name, "while"))        type = Built_In_While;
     else return nullptr;
 
-    Ast_Node* node = new(Ast_Node);
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_Built_In_Function;
     node->value.built_in_function = new(Built_In_Function);
     node->value.built_in_function->type = type;
@@ -334,7 +340,7 @@ Ast_Node* create_ast_node_built_in_function(char* name) {
 }
 
 Ast_Node* create_ast_node_pair(Ast_Node* first, Ast_Node* rest) {
-    Ast_Node* node = new(Ast_Node);
+    Ast_Node* node = create_ast_node();
     node->type = Ast_Node_Type_Pair;
     node->value.pair = new(Pair);
     node->value.pair->first = first;
@@ -343,7 +349,7 @@ Ast_Node* create_ast_node_pair(Ast_Node* first, Ast_Node* rest) {
 }
 
 Ast_Node* copy_ast_node(Ast_Node* n) {
-    Ast_Node* target = new(Ast_Node);
+    Ast_Node* target = create_ast_node();
     *target = *n;
     return target;
 }
diff --git a/src/helpers.c b/src/helpers.c
index 046e8f9..e2fd562 100644
--- a/src/helpers.c
+++ b/src/helpers.c
@@ -227,14 +227,16 @@ char* read_line() {
 typedef struct {
     char* file;
     int line;
+    int column;
 } Source_Code_Location;
 
-Source_Code_Location* create_source_code_location(char* file, int line) {
+Source_Code_Location* create_source_code_location(char* file, int line, int col) {
     if (!file)
         return nullptr;
-    
+
     Source_Code_Location* ret = new(Source_Code_Location);
-    ret->file = file;
-    ret->line = line;
+    ret->file   = file;
+    ret->line   = line;
+    ret->column = col;
     return ret;
 }
diff --git a/src/io.c b/src/io.c
index 45d1573..523242f 100644
--- a/src/io.c
+++ b/src/io.c
@@ -98,7 +98,10 @@ void print(Ast_Node* node) {
 
 void print_error_location() {
     if (error->location) {
-        printf("%s: %d", error->location->file, error->location->line);
+        printf("%s (line %d, position %d)",
+               error->location->file,
+               error->location->line,
+               error->location->column);
     } else {
         printf("no source code location avaliable");
     }
diff --git a/src/parse.c b/src/parse.c
index 130ab69..2688e55 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -1,5 +1,13 @@
 char* parser_file;
 int parser_line;
+int parser_col;
+
+#define inject_scl(_ret)                                         \
+    ret->sourceCodeLocation = new(Source_Code_Location);         \
+    ret->sourceCodeLocation->file   = parser_file;               \
+    ret->sourceCodeLocation->line   = parser_line;               \
+    ret->sourceCodeLocation->column = parser_col
+
 
 // TODO(Felix): use the array list macro here?
 Ast_Node_Array_List* create_Ast_Node_Array_List(int initial_length) {
@@ -30,13 +38,10 @@ void eat_comment_line(char* text, int* index_in_text) {
     // eat the comment line
     do {
         ++(*index_in_text);
+        ++parser_col;
     } while (text[(*index_in_text)] != '\n' &&
              text[(*index_in_text)] != '\r' &&
              text[(*index_in_text)] != '\0');
-
-    if (text[(*index_in_text)] == '\n') {
-        ++parser_line;
-    }
 }
 
 void eat_whitespace(char* text, int* index_in_text) {
@@ -44,12 +49,16 @@ void eat_whitespace(char* text, int* index_in_text) {
     while (text[(*index_in_text)] == ' '  ||
            text[(*index_in_text)] == '\t' ||
            text[(*index_in_text)] == '\n' ||
-           text[(*index_in_text)] == '\r') {
+           text[(*index_in_text)] == '\r')
+    {
+        if (text[(*index_in_text)] == '\n') {
+            ++parser_line;
+            parser_col = 0;
+        }
+        ++parser_col;
         ++(*index_in_text);
     }
-    if (text[(*index_in_text)] == '\n') {
-        ++parser_line;
-    }
+
 }
 
 void eat_until_code(char* text, int* index_in_text) {
@@ -98,33 +107,43 @@ Ast_Node* parse_number(char* text, int* index_in_text) {
     double number;
     char* str_number = read_atom(text, index_in_text);
     sscanf(str_number, "%lf", &number);
-    return create_ast_node_number(number);
+    Ast_Node* ret = create_ast_node_number(number);
+    inject_scl(ret);
+    return ret;
 }
 
 
 Ast_Node* parse_keyword(char* text, int* index_in_text) {
     // we are now on the colon
     ++(*index_in_text);
+    ++parser_col;
     char* str_keyword = read_atom(text, index_in_text);
-    return create_ast_node_keyword(str_keyword);
+    Ast_Node* ret = create_ast_node_keyword(str_keyword);
+    inject_scl(ret);
+    return ret;
 }
 
 Ast_Node* parse_symbol(char* text, int* index_in_text) {
     // we are now at the first char of the symbol
     char* str_symbol = read_atom(text, index_in_text);
-    return create_ast_node_symbol(str_symbol);
+    Ast_Node* ret = create_ast_node_symbol(str_symbol);
+    inject_scl(ret);
+    return ret;
 }
 
 Ast_Node* parse_string(char* text, int* index_in_text) {
     // the first character is the '"'
     ++(*index_in_text);
+    ++parser_col;
 
     // now we are at the first letter, if this is the closing '"' then
     // it's easy
     if (text[*index_in_text] == '"') {
         char* str = new(char);
         *str = '\0';
-        return create_ast_node_string(str, 0);
+        Ast_Node* ret = create_ast_node_string(str, 0);
+        inject_scl(ret);
+        return ret;
     }
 
     // okay so the first letter was not actually closing the string...
@@ -143,7 +162,7 @@ Ast_Node* parse_string(char* text, int* index_in_text) {
     if (!unescape_string(text+(*index_in_text))) {
         create_error(
             Error_Type_Unknown_Error,
-            create_source_code_location(parser_file, parser_line));
+            create_source_code_location(parser_file, parser_line, parser_col));
         return nullptr;
     }
     strcpy(string, text+(*index_in_text));
@@ -159,7 +178,9 @@ Ast_Node* parse_string(char* text, int* index_in_text) {
     *index_in_text += string_length +1; // plus one because we want to
                                         // go after the quotes
 
-    return create_ast_node_string(string, string_length);
+    Ast_Node* ret = create_ast_node_string(string, string_length);
+    inject_scl(ret);
+    return ret;
 }
 
 Ast_Node* parse_atom(char* text, int* index_in_text) {
@@ -193,6 +214,7 @@ Ast_Node* parse_atom(char* text, int* index_in_text) {
 Ast_Node* parse_expression(char* text, int* index_in_text) {
     if (text[*index_in_text] == '\'') {
         ++(*index_in_text);
+        ++parser_col;
         Ast_Node* result;
         if (text[*index_in_text] == '(' || text[*index_in_text] == '\'' ) {
             try {
@@ -208,12 +230,14 @@ Ast_Node* parse_expression(char* text, int* index_in_text) {
             create_ast_node_pair(result, create_ast_node_nil()));
     }
     ++(*index_in_text);
+    ++parser_col;
 
     eat_whitespace(text, index_in_text);
 
     // if there was actually nothing in the list, return nil
     if (text[(*index_in_text)] == ')') {
         ++(*index_in_text);
+        ++parser_col;
         return create_ast_node_nil();
     }
 
@@ -236,16 +260,18 @@ Ast_Node* parse_expression(char* text, int* index_in_text) {
 
         eat_until_code(text, index_in_text);
         if (text[(*index_in_text)] == '\0') {
-            create_error(Error_Type_Unexpected_Eof, create_source_code_location(parser_file, parser_line));
+            create_error(Error_Type_Unexpected_Eof, create_source_code_location(parser_file, parser_line, parser_col));
             return nullptr;
         }
 
 
         if (text[(*index_in_text)] == ')') {
             head->value.pair->rest = create_ast_node_nil();
+            ++parser_col;
             ++(*index_in_text);
             break;
         } else if (text[(*index_in_text)] == '.') {
+            ++parser_col;
             ++(*index_in_text);
             eat_until_code(text, index_in_text);
 
@@ -257,7 +283,8 @@ Ast_Node* parse_expression(char* text, int* index_in_text) {
             eat_until_code(text, index_in_text);
 
             if (text[(*index_in_text)] != ')')
-                create_error(Error_Type_Syntax_Error, create_source_code_location(parser_file, parser_line));
+                create_error(Error_Type_Syntax_Error, create_source_code_location(parser_file, parser_line, parser_col));
+            ++parser_col;
             ++(*index_in_text);
             break;
         } else {
@@ -269,6 +296,10 @@ Ast_Node* parse_expression(char* text, int* index_in_text) {
 }
 
 Ast_Node* parse_single_expression(char* text) {
+    parser_file = "stdin";
+    parser_line = 1;
+    parser_col = 1;
+
     int index_in_text = 0;
     Ast_Node* result;
     eat_until_code(text, &index_in_text);
@@ -283,13 +314,16 @@ Ast_Node* parse_single_expression(char* text) {
     eat_until_code(text, &index_in_text);
     if (text[(index_in_text)] == '\0')
         return result;
-    create_error(Error_Type_Trailing_Garbage, create_source_code_location(parser_file, parser_line));
+    create_error(Error_Type_Trailing_Garbage, create_source_code_location(parser_file, parser_line, parser_col));
     return nullptr;
 }
 
 Ast_Node_Array_List* parse_program(char* file_name, char* text) {
     parser_file = (char*)malloc(strlen(file_name) * sizeof(char) + 1);
     strcpy(parser_file, file_name);
+    parser_line = 1;
+    parser_col = 0;
+
     Ast_Node_Array_List* program = create_Ast_Node_Array_List(16);
 
     int index_in_text = 0;
@@ -312,9 +346,11 @@ Ast_Node_Array_List* parse_program(char* file_name, char* text) {
         } break;
         default:
             /* syntax error */
-            create_error(Error_Type_Syntax_Error, create_source_code_location(parser_file, parser_line));
+            create_error(Error_Type_Syntax_Error, create_source_code_location(parser_file, parser_line, parser_col));
             return nullptr;
         }
     }
     return program;
 }
+
+#undef inject_scl