diff --git a/.gitignore b/.gitignore
index 9f8352f..a32fba6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@ main.spec
 dist-*/
 build/
 assets/
-run-miled.spec
\ No newline at end of file
+run-miled.spec
+pyinstaller-build
\ No newline at end of file
diff --git a/interpreter/builtins.py b/interpreter/builtins.py
index 5de9caf..c423915 100644
--- a/interpreter/builtins.py
+++ b/interpreter/builtins.py
@@ -120,6 +120,8 @@ def map_over(f: Caller, old_list: list, table: Env):
     "wS": Caller(1, lambda x, _: (x[0][1].split(), None)),
     ",S": Caller(1, lambda x, _: (x[0][1].split(","), None)),
 
+    "join": Caller(2, lambda x, _: (x[0][1].join(x[1][1]), None)),
+
     "map": Caller(2, lambda x, t: (map_over(x[0][1], x[1][1], t), None)),
 
     # * ARITHMETIC FUNCTIONS
diff --git a/interpreter/lex.py b/interpreter/lex.py
index 9bf8f90..a451348 100644
--- a/interpreter/lex.py
+++ b/interpreter/lex.py
@@ -33,7 +33,12 @@ def to_token(buf: str) -> Token:
     if buf[0] == "\"" and buf[-1] == "\"":
         return Token(
             Token.VAL,
-            buf[1:-1].replace("\\\"", "\"").replace("\\\\", "\\")
+            buf[1:-1]
+            .replace(r"\"", "\"")
+            .replace(r"\\", "\\")
+            .replace(r"\n", "\n")
+            .replace(r"\t", "\t")
+            .replace(r"\r", "\r")
         )
     elif is_int(buf):
         return Token(Token.VAL, int(buf))
@@ -45,6 +50,8 @@ def to_token(buf: str) -> Token:
         return Token(Token.VAL, False)
     elif buf == "??":
         return Token(Token.VAL, None)
+    elif buf == "[]":
+        return Token(Token.VAL, [])
     elif buf in KEYWORDS:
         return Token(Token.KW, buf)
     else:
diff --git a/interpreter/readable_test.py b/interpreter/readable_test.py
index 6599014..24790e1 100644
--- a/interpreter/readable_test.py
+++ b/interpreter/readable_test.py
@@ -110,18 +110,18 @@ def test_interpreter(self):
         )
         self.assertEqual(
             # A FizzBuzz Example
-            " ".join([
+            "\n".join([
                 "FizzBuzz" if i % 3 == 0 and i % 5 == 0 else
                 "Fizz" if i % 3 == 0 else
                 "Buzz" if i % 5 == 0
                 else str(i)
                 for i in range(1, 101)
-            ]) + " ",
-            Interpreter("""
+            ]),
+            Interpreter(r"""
             := x 0
-            := s ""
+            := s []
             while: ~ += x 1 != x 101 ;
-                += s if::
+                push s if::
                     & div 3 x div 5 x "FizzBuzz"
                     else
                         if:: div 3 x "Fizz"
@@ -131,9 +131,8 @@ def test_interpreter(self):
                             :fi
                         :fi
                     :fi
-                += s " "
             :ihw
-            s
+            join "\n" s
             """).run()
         )
         self.assertEqual(
diff --git a/main.py b/main.py
index 570fbeb..19bd14b 100644
--- a/main.py
+++ b/main.py
@@ -1,6 +1,18 @@
 from interpreter.interpret import Interpreter
 from argparse import ArgumentParser
 
+
+def try_run(code: str):
+    itpr = Interpreter(code)
+    try:
+        print(itpr.run())
+    except Exception as IE:
+        print("Cannot run program, an error occurred:")
+        print(IE)
+        print("near: \"" + str(itpr.tokens[itpr.i].value) + "\" at word #" + str(itpr.i))
+        print("Check your code. If you confirm there shouldn't be any problem, report an issue.")
+
+
 if __name__ == "__main__":
     parser = ArgumentParser("Miled language interpreter")
     parser.add_argument("-f", "--file")
@@ -10,19 +22,11 @@
     try:
         if args.file is not None:
             file = open(args.file, "r").read()
-            print(Interpreter(file).run())
+            try_run(file)
         elif args.code is not None:
-            print(Interpreter(args.code).run())
+            try_run(args.code)
     except FileNotFoundError:
         print("File not found.")
-    except IndexError as E:
-        print(E)
-        print("An IndexError occurred. It's likely that you've used an index out of range, or you have too many "
-              "enclosing marks. Check your code.")
-    except TypeError as E:
-        print(E)
-        print("A TypeError occurred. It's likely that you've forgot to enclose a Caller, or you messed "
-              "up the types. Use \"->...\" commands to convert types.")
     except Exception as E:
-        print("An error occurred.")
+        print("Unknown error occurred:")
         print(E)