Add cfg_attr predicate completion

Example
---
```rust
#[cfg_attr($0, must_use)]
struct Foo;
```

2 files changed, 53 insertions, 1 deletions

diff --git a/src/tools/rust-analyzer/crates/ide-completion/src/completions/attribute.rs b/src/tools/rust-analyzer/crates/ide-completion/src/completions/attribute.rs
index c542e140df5..e174b0c8922 100644
--- a/src/tools/rust-analyzer/crates/ide-completion/src/completions/attribute.rs
+++ b/src/tools/rust-analyzer/crates/ide-completion/src/completions/attribute.rs
@@ -70,7 +70,7 @@ pub(crate) fn complete_known_attribute_input(
 
             lint::complete_lint(acc, ctx, colon_prefix, &existing_lints, &lints);
         }
-        ["cfg"] => cfg::complete_cfg(acc, ctx),
+        ["cfg"] | ["cfg_attr"] => cfg::complete_cfg(acc, ctx),
         ["macro_use"] => macro_use::complete_macro_use(
             acc,
             ctx,
diff --git a/src/tools/rust-analyzer/crates/ide-completion/src/tests/attribute.rs b/src/tools/rust-analyzer/crates/ide-completion/src/tests/attribute.rs
index 46a36300459..30e1e108c6c 100644
--- a/src/tools/rust-analyzer/crates/ide-completion/src/tests/attribute.rs
+++ b/src/tools/rust-analyzer/crates/ide-completion/src/tests/attribute.rs
@@ -836,6 +836,58 @@ mod cfg {
     }
 
     #[test]
+    fn inside_cfg_attr() {
+        check(
+            r#"
+//- /main.rs cfg:test,dbg=false,opt_level=2
+#[cfg_attr($0)]
+"#,
+            expect![[r#"
+                ba dbg
+                ba opt_level
+                ba test
+                ba true
+            "#]],
+        );
+        check(
+            r#"
+//- /main.rs cfg:test,dbg=false,opt_level=2
+#[cfg_attr(b$0)]
+"#,
+            expect![[r#"
+                ba dbg
+                ba opt_level
+                ba test
+                ba true
+            "#]],
+        );
+        check(
+            r#"
+//- /main.rs cfg:test,dbg=false,opt_level=2
+#[cfg_attr($0, allow(deprecated))]
+"#,
+            expect![[r#"
+                ba dbg
+                ba opt_level
+                ba test
+                ba true
+            "#]],
+        );
+        check(
+            r#"
+//- /main.rs cfg:test,dbg=false,opt_level=2
+#[cfg_attr(b$0, allow(deprecated))]
+"#,
+            expect![[r#"
+                ba dbg
+                ba opt_level
+                ba test
+                ba true
+            "#]],
+        );
+    }
+
+    #[test]
     fn cfg_target_endian() {
         check(
             r#"#[cfg(target_endian = $0"#,