diff --git a/.gitignore b/.gitignore
index 91ed038b..0e27b9dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,4 +27,6 @@ main.obj
 pocketpy.exp
 pocketpy.lib
 APPS
-build
\ No newline at end of file
+build
+
+pocketpy.dSYM
\ No newline at end of file
diff --git a/build.py b/build.py
index 9d975e05..7d46f675 100644
--- a/build.py
+++ b/build.py
@@ -15,7 +15,7 @@ main_src_arg = " ".join(src_file_list+["src2/main.cpp"])
 
 print(main_src_arg)
 
-linux_common = " -Wfatal-errors --std=c++17 -O2 -Wall -fno-rtti -stdlib=libc++ -Iinclude/ "
+linux_common = " -Wfatal-errors --std=c++17 -O1 -Wall -fno-rtti -stdlib=libc++ -Iinclude/ "
 linux_cmd = "clang++ -o pocketpy " + main_src_arg + linux_common
 
 if "web" in sys.argv:
diff --git a/src/lexer.cpp b/src/lexer.cpp
index bd30e9c0..d6e12020 100644
--- a/src/lexer.cpp
+++ b/src/lexer.cpp
@@ -217,7 +217,7 @@ namespace pkpy{
                         char code;
                         try{
                             code = (char)Number::stoi(hex, &parsed, 16);
-                        }catch(std::invalid_argument&){
+                        }catch(...){
                             SyntaxError("invalid hex char");
                         }
                         if (parsed != 2) SyntaxError("invalid hex char");
@@ -259,21 +259,24 @@ namespace pkpy{
             return;
         }
 
+        if(m[1].matched && m[2].matched){
+            SyntaxError("hex literal should not contain a dot");
+        }
+
         try{
             int base = 10;
             size_t size;
             if (m[1].matched) base = 16;
             if (m[2].matched) {
-                if(base == 16) SyntaxError("hex literal should not contain a dot");
+                PK_ASSERT(base == 10);
                 add_token(TK("@num"), Number::stof(m[0], &size));
             } else {
                 add_token(TK("@num"), Number::stoi(m[0], &size, base));
             }
             PK_ASSERT((int)size == (int)m.length());
-        }catch(std::exception& e){
-            PK_UNUSED(e);
+        }catch(...){
             SyntaxError("invalid number literal");
-        } 
+        }
     }
 
     bool Lexer::lex_one_token() {
diff --git a/src/pocketpy.cpp b/src/pocketpy.cpp
index c322c6a6..c055a2d8 100644
--- a/src/pocketpy.cpp
+++ b/src/pocketpy.cpp
@@ -308,9 +308,9 @@ void init_builtins(VM* _vm) {
             try{
                 size_t parsed = 0;
                 i64 val = Number::stoi(s.str(), &parsed, base);
-                if(parsed != s.length()) throw std::invalid_argument("<?>");
+                PK_ASSERT(parsed == s.length());
                 return VAR(val);
-            }catch(std::invalid_argument&){
+            }catch(...){
                 vm->ValueError("invalid literal for int(): " + s.escape());
             }
         }
@@ -368,7 +368,7 @@ void init_builtins(VM* _vm) {
             try{
                 f64 val = Number::stof(s.str());
                 return VAR(val);
-            }catch(std::invalid_argument&){
+            }catch(...){
                 vm->ValueError("invalid literal for float(): " + s.escape());
             }
         }