From c8cfd96365b4444b8c95fc8f79adb11936827b69 Mon Sep 17 00:00:00 2001
From: A4-Tacks <wdsjxhno1001@163.com>
Date: Sun, 29 Mar 2026 07:05:59 +0800
Subject: [PATCH] fix: complete envs in nested `env!()`

Example
---
```rust
fn main() {
    println!("{}", env!("CA$0"));
}
```

**Before this PR**

Cannot complete any env

**After this PR**

```rust
fn main() {
    println!("{}", env!("CARGO_BIN_NAME"));
}
```
---
 .../src/completions/env_vars.rs               | 50 +++++++++++++++++--
 1 file changed, 45 insertions(+), 5 deletions(-)

diff --git a/crates/ide-completion/src/completions/env_vars.rs b/crates/ide-completion/src/completions/env_vars.rs
index 92cbf411c1e3..885d1a30750f 100644
--- a/crates/ide-completion/src/completions/env_vars.rs
+++ b/crates/ide-completion/src/completions/env_vars.rs
@@ -51,11 +51,10 @@ pub(crate) fn complete_cargo_env_vars(
     original: &ast::String,
     expanded: &ast::String,
 ) -> Option<()> {
-    let is_in_env_expansion = ctx
-        .sema
-        .hir_file_for(&expanded.syntax().parent()?)
-        .macro_file()
-        .is_some_and(|it| it.is_env_or_option_env(ctx.sema.db));
+    let descends = ctx.sema.descend_into_macros_exact_with_file(original.syntax().clone());
+    let macro_file = descends.first()?.file_id.macro_file();
+
+    let is_in_env_expansion = macro_file.is_some_and(|it| it.is_env_or_option_env(ctx.sema.db));
     if !is_in_env_expansion {
         let call = macro_call_for_string_token(expanded)?;
         let makro = ctx.sema.resolve_macro_call(&call)?;
@@ -116,6 +115,47 @@ fn main() {
         );
     }
 
+    #[test]
+    fn complete_in_expanded_env_macro() {
+        check_edit(
+            "CARGO_BIN_NAME",
+            r#"
+//- minicore: env
+macro_rules! bar {
+    ($($arg:tt)*) => { $($arg)* }
+}
+
+fn main() {
+    let foo = bar!(env!("CA$0"));
+}
+        "#,
+            r#"
+macro_rules! bar {
+    ($($arg:tt)*) => { $($arg)* }
+}
+
+fn main() {
+    let foo = bar!(env!("CARGO_BIN_NAME"));
+}
+        "#,
+        );
+
+        check_edit(
+            "CARGO_BIN_NAME",
+            r#"
+//- minicore: env, fmt
+fn main() {
+    let foo = format_args!("{}", env!("CA$0"));
+}
+        "#,
+            r#"
+fn main() {
+    let foo = format_args!("{}", env!("CARGO_BIN_NAME"));
+}
+        "#,
+        );
+    }
+
     #[test]
     fn doesnt_complete_in_random_strings() {
         let fixture = r#"