fix: adjust imports to look in the parent module

For now, all imports are for external schemas only and those are
expected to be placed next to the module where these imports are
declared. Therefore, the generated Rust code should look in the parent
module instead of in its own modules.

crates/stef-build/src/definition.rs

@@ -199,7 +199,8 @@ fn compile_import(Import { segments, element }: &Import<'_>) -> TokenStream {
     });
 
     quote! {
-        use #(#segments)*#element;
+        #[allow(unused_imports)]
+        use super::#(#segments)*#element;
     }
 }
 

crates/stef-build/tests/snapshots/compiler__compile@import_basic.stef.snap

@@ -5,6 +5,8 @@ input_file: crates/stef-parser/tests/inputs/import_basic.stef
 ---
 #[allow(unused_imports)]
 use ::stef::buf::{Decode, Encode};
-use other::schema::Sample;
-use second::submodule;
+#[allow(unused_imports)]
+use super::other::schema::Sample;
+#[allow(unused_imports)]
+use super::second::submodule;
 

crates/stef-build/tests/snapshots/compiler__compile_extra@import.stef.snap

@@ -5,6 +5,8 @@ input_file: crates/stef-build/tests/inputs_extra/import.stef
 ---
 #[allow(unused_imports)]
 use ::stef::buf::{Decode, Encode};
-use other::module;
-use other::module::Type;
+#[allow(unused_imports)]
+use super::other::module;
+#[allow(unused_imports)]
+use super::other::module::Type;
 

crates/stef-playground/src/lib.rs

@@ -56,10 +56,17 @@ mod schemas {
         stef::include!("enum_min_ws");
     }
 
-    // TODO: implement imports
-    // mod import_basic {
-    //     stef::include!("import_basic");
-    // }
+    mod import_basic {
+        stef::include!("import_basic");
+    }
+
+    mod other {
+        stef::include!("other");
+    }
+
+    mod second {
+        stef::include!("second");
+    }
 
     mod module_basic {
         stef::include!("module_basic");