fix: Fix nested includes resolving from the wrong base file

Author: Veykril

crates/hir-def/src/nameres/tests/macros.rs

@@ -1264,6 +1264,54 @@ struct A;
     );
 }
 
+#[test]
+fn nested_include() {
+    check(
+        r#"
+//- minicore: include
+//- /lib.rs
+include!("out_dir/includes.rs");
+
+//- /out_dir/includes.rs
+pub mod company_name {
+    pub mod network {
+        pub mod v1 {
+            include!("company_name.network.v1.rs");
+        }
+    }
+}
+//- /out_dir/company_name.network.v1.rs
+pub struct IpAddress {
+    pub ip_type: &'static str,
+}
+/// Nested message and enum types in `IpAddress`.
+pub mod ip_address {
+    pub enum IpType {
+        IpV4(u32),
+    }
+}
+
+"#,
+        expect![[r#"
+            crate
+            company_name: t
+
+            crate::company_name
+            network: t
+
+            crate::company_name::network
+            v1: t
+
+            crate::company_name::network::v1
+            IpAddress: t
+            ip_address: t
+
+            crate::company_name::network::v1::ip_address
+            IpType: t
+        "#]],
+    );
+}
+
 #[test]
 fn macro_use_imports_all_macro_types() {
     let db = TestDB::with_files(

crates/hir-expand/src/builtin_fn_macro.rs

@@ -15,7 +15,7 @@ use crate::{
     quote,
     quote::dollar_crate,
     tt::{self, DelimSpan},
-    ExpandError, ExpandResult, HirFileIdExt, MacroCallId,
+    ExpandError, ExpandResult, HirFileIdExt, MacroCallId, MacroFileIdExt,
 };
 
 macro_rules! register_builtin {
@@ -609,7 +609,7 @@ fn relative_file(
     path_str: &str,
     allow_recursion: bool,
 ) -> Result<FileId, ExpandError> {
-    let call_site = call_id.as_file().original_file(db);
+    let call_site = call_id.as_macro_file().parent(db).original_file_respecting_includes(db);
     let path = AnchoredPath { anchor: call_site, path: path_str };
     let res = db
         .resolve_path(path)

crates/hir-expand/src/lib.rs

@@ -318,6 +318,7 @@ pub trait MacroFileIdExt {
     fn expansion_level(self, db: &dyn ExpandDatabase) -> u32;
     /// If this is a macro call, returns the syntax node of the call.
     fn call_node(self, db: &dyn ExpandDatabase) -> InFile<SyntaxNode>;
+    fn parent(self, db: &dyn ExpandDatabase) -> HirFileId;
 
     fn expansion_info(self, db: &dyn ExpandDatabase) -> ExpansionInfo;
 
@@ -353,6 +354,9 @@ impl MacroFileIdExt for MacroFileId {
             };
         }
     }
+    fn parent(self, db: &dyn ExpandDatabase) -> HirFileId {
+        self.macro_call_id.lookup(db).kind.file_id()
+    }
 
     /// Return expansion information if it is a macro-expansion file
     fn expansion_info(self, db: &dyn ExpandDatabase) -> ExpansionInfo {