Merge pull request #7412 from gamebox/issue-7407

#7407: Register package dependent packages

crates/compiler/load_internal/src/file.rs

@@ -1317,8 +1317,13 @@ fn handle_root_type<'a>(
 
         use HeaderType::*;
 
+        let use_main = match header_type {
+            Package { .. } | App { .. } | Platform { .. } => true,
+            Module { .. } | Builtin { .. } | Hosted { .. } => false,
+        };
+
         match header_type {
-            Module { .. } | Builtin { .. } | Hosted { .. } => {
+            Module { .. } | Builtin { .. } | Hosted { .. } | Package { .. } => {
                 let main_path = opt_main_path.or_else(|| find_main_roc_recursively(src_dir));
 
                 let cache_dir = roc_cache_dir.as_persistent_path();
@@ -1340,9 +1345,15 @@ fn handle_root_type<'a>(
                     header_output.msg = Msg::Many(messages);
                 }
 
-                Ok((header_output, RootType::Module { main_path }))
+                let root_type = if use_main {
+                    RootType::Main
+                } else {
+                    RootType::Module { main_path }
+                };
+
+                Ok((header_output, root_type))
             }
-            App { .. } | Package { .. } | Platform { .. } => Ok((header_output, RootType::Main)),
+            App { .. } | Platform { .. } => Ok((header_output, RootType::Main)),
         }
     } else {
         Ok((header_output, RootType::Main))

crates/compiler/load_internal/tests/test_load.rs

@@ -2131,3 +2131,51 @@ fn roc_file_no_extension() {
 
     assert_eq!(err, expected, "\n{}", err);
 }
+
+#[test]
+fn roc_package_depends_on_other_package() {
+    let modules = vec![
+        (
+            "main",
+            indoc!(
+                r#"
+            package [Module] { other: "other/main.roc" }
+            "#
+            ),
+        ),
+        (
+            "Module.roc",
+            indoc!(
+                r#"
+            module [foo]
+
+            import other.OtherMod
+
+            foo = OtherMod.say "hello"
+            "#
+            ),
+        ),
+        (
+            "other/main.roc",
+            indoc!(
+                r#"
+            package [OtherMod] {}
+            "#
+            ),
+        ),
+        (
+            "other/OtherMod.roc",
+            indoc!(
+                r#"
+            module [say]
+
+            say = \msg -> "$(msg), world!"
+            "#
+            ),
+        ),
+    ];
+
+    let result = multiple_modules("roc_package_depends_on_other_package", modules);
+
+    assert!(result.is_ok());
+}