Switch to ungrammar from ast_src

The primary advantage of ungrammar is that it (eventually) allows one
to describe concrete syntax tree structure -- with alternatives and
specific sequence of tokens & nodes.

That should be re-usable for:

* generate `make` calls
* Rust reference
* Hypothetical parser's evented API

We loose doc comments for the time being unfortunately. I don't think
we should add support for doc comments to ungrammar -- they'll make
grammar file hard to read. We might supply docs as out-of band info,
or maybe just via a reference, but we'll think about that once things
are no longer in flux

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_hir_def/src/type_ref.rs b/crates/ra_hir_def/src/type_ref.rs
index e90b2a0b9..970fc9af5 100644
--- a/crates/ra_hir_def/src/type_ref.rs
+++ b/crates/ra_hir_def/src/type_ref.rs
@@ -1,7 +1,7 @@
 //! HIR for references to types. Paths in these are not yet resolved. They can
 //! be directly created from an ast::TypeRef, without further queries.
 
-use ra_syntax::ast::{self, TypeAscriptionOwner, TypeBoundsOwner};
+use ra_syntax::ast::{self, TypeAscriptionOwner};
 
 use crate::{body::LowerCtx, path::Path};