Fix the type annotation of the generated stubs

pyo3-stub-gen-testing-mixed/python/pyo3_stub_gen_testing_mixed/my_rust_pkg.pyi

@@ -3,7 +3,7 @@
 from typing import final, Any, List, Dict
 from enum import Enum, auto
 
-def sum_as_string(a,b) -> str:
+def sum_as_string(a:int,b:int) -> str:
     r"""
     Returns the sum of two numbers as a string.
     """

pyo3-stub-gen-testing-mixed/tests/test_mixed.py

@@ -2,4 +2,4 @@
 
 
 def test_sum_as_string():
-    assert pyo3_stub_gen_testing_mixed.my_rust_pkg.sum_as_string(1, "a") == "3"
+    assert pyo3_stub_gen_testing_mixed.my_rust_pkg.sum_as_string(1, 2) == "3"

pyo3-stub-gen-testing-pure/pyo3_stub_gen_testing_pure.pyi

@@ -3,7 +3,7 @@
 from typing import final, Any, List, Dict
 from enum import Enum, auto
 
-def sum_as_string(a,b) -> str:
+def sum_as_string(a:int,b:int) -> str:
     r"""
     Returns the sum of two numbers as a string.
     """

pyo3-stub-gen/src/generate.rs

@@ -34,7 +34,7 @@ impl Arg {
 
 impl fmt::Display for Arg {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", self.name)
+        write!(f, "{}:{}", self.name, self.r#type)
     }
 }
 
@@ -463,7 +463,6 @@ impl StubInfo {
         let python_source = self.pyproject.python_source().unwrap();
         for (name, module) in self.modules.iter() {
             let path: Vec<&str> = name.split('.').collect();
-            dbg!(&path);
             let dest = if path.len() > 1 {
                 python_source.join(format!("{}.pyi", path.join("/")))
             } else {