Avoid forward declaring the entry point without actually defining it

src/IRBuilder.cpp

@@ -37,6 +37,11 @@ void IRBuilder::create_program(std::shared_ptr<ProgramNode> program)
         {
             Error::throw_error_without_location(format_string("Missing entry point: %s", Arguments::values["entry"]));
         }
+        if (module->getFunction(Arguments::values["entry"])->empty())
+        {
+            Error::throw_error_without_location(
+                format_string("Entry point %s has no body", Arguments::values["entry"]));
+        }
     }
 }
 

tests/declare-main.json

@@ -2,8 +2,8 @@
     "file": "declare-main.sp",
     "compile": {
         "flags": [],
-        "exit-code": 0,
+        "exit-code": 1,
         "stdout": "",
-        "stderr": ""
+        "stderr": "\u001b[1;1m\u001b[31;49merror: \u001b[0;0mEntry point main has no body\n"
     }
 }