Fix stuff

src/main.cpp

@@ -1,10 +1,19 @@
 #include "lexer/lexer.hpp"
 #include "parser/parser.hpp"
+#include <iostream>
+#include <stdexcept>
 
 int main() {
-    Solstice::Lexer lexer{"2 + 2"};
-    auto lexed = lexer.lex();
+    try {
+        Solstice::Lexer lexer{"2 + 2"};
+        auto lexed = lexer.lex();
 
-    Solstice::Parser parser{lexed};
-    auto parsed = parser.parse();
+        Solstice::Parser parser{lexed};
+        auto parsed = parser.parse();
+
+    } catch (const std::runtime_error& e) {
+        std::cout << e.what() << std::endl;
+        return 1;
+    }
+    return 0;
 }