Make `ast_to_token_tree` infallible

It could never return `None`, so reflect that in the return type

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/hir_def/src/attr.rs b/crates/hir_def/src/attr.rs
index 2bab121d9..442c5fb5b 100644
--- a/crates/hir_def/src/attr.rs
+++ b/crates/hir_def/src/attr.rs
@@ -533,7 +533,7 @@ impl Attr {
             };
             Some(AttrInput::Literal(value))
         } else if let Some(tt) = ast.token_tree() {
-            Some(AttrInput::TokenTree(ast_to_token_tree(&tt)?.0))
+            Some(AttrInput::TokenTree(ast_to_token_tree(&tt).0))
         } else {
             None
         };