add error for __init__ method

self_hosted/parser.jou

@@ -912,6 +912,8 @@ class Parser:
         self->tokens++
 
         signature = self->parse_function_or_method_signature(is_method)
+        if strcmp(signature.name, "__init__") == 0 and is_method:
+            fail(self->tokens->location, "Jou does not have a special __init__ method like Python")
         if signature.takes_varargs:
             fail(self->tokens->location, "functions with variadic arguments cannot be defined yet")
 

src/parse.c

@@ -786,6 +786,9 @@ static AstFunction parse_funcdef(ParserState *ps, bool is_method)
 
     struct AstFunction funcdef = {0};
     funcdef.signature = parse_function_signature(ps, is_method);
+    if (!strcmp(funcdef.signature.name, "__init__") && is_method) {
+        fail_with_error(ps->tokens->location, "Jou does not have a special __init__ method like Python");
+    }
     if (funcdef.signature.takes_varargs) {
         // TODO: support "def foo(x: str, ...)" in some way
         fail_with_error(ps->tokens->location, "functions with variadic arguments cannot be defined yet");

tests/other_errors/python_init_method.jou

@@ -0,0 +1,3 @@
+class Foo:
+    def __init__(self) -> void:  # Error: Jou does not have a special __init__ method like Python
+        pass