2 files changed, 3 insertions, 1 deletions

diff --git a/crates/hir_expand/src/builtin_derive.rs b/crates/hir_expand/src/builtin_derive.rs
index dfdb9cf59..5e908b223 100644
--- a/crates/hir_expand/src/builtin_derive.rs
+++ b/crates/hir_expand/src/builtin_derive.rs
@@ -108,7 +108,7 @@ fn parse_adt(tt: &tt::Subtree) -> Result<BasicAdtInfo, mbe::ExpandError> {
 }
 
 fn make_type_args(n: usize, bound: Vec<tt::TokenTree>) -> Vec<tt::TokenTree> {
-    let mut result = Vec::<tt::TokenTree>::new();
+    let mut result = Vec::<tt::TokenTree>::with_capacity(n * 2);
     result.push(
         tt::Leaf::Punct(tt::Punct {
             char: '<',
diff --git a/crates/hir_expand/src/db.rs b/crates/hir_expand/src/db.rs
index cb6e23320..9086e6c17 100644
--- a/crates/hir_expand/src/db.rs
+++ b/crates/hir_expand/src/db.rs
@@ -340,6 +340,8 @@ fn parse_macro_with_arg(
         None => return ExpandResult { value: None, err: result.err },
     };
 
+    log::debug!("expanded = {}", tt.as_debug_string());
+
     let fragment_kind = to_fragment_kind(db, macro_call_id);
 
     let (parse, rev_token_map) = match mbe::token_tree_to_syntax_node(&tt, fragment_kind) {