Collect HirDisplay impls to a single file

1 files changed, 25 insertions, 0 deletions

diff --git a/crates/hir/src/display.rs b/crates/hir/src/display.rs
new file mode 100644
index 000000000..86f48256e
--- /dev/null
+++ b/crates/hir/src/display.rs
@@ -0,0 +1,25 @@
+//! HirDisplay implementations for various hir types.
+use hir_ty::display::{
+    write_bounds_like_dyn_trait_with_prefix, HirDisplay, HirDisplayError, HirFormatter,
+};
+
+use crate::{Substs, Type, TypeParam};
+
+impl HirDisplay for Type {
+    fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
+        self.ty.value.hir_fmt(f)
+    }
+}
+
+impl HirDisplay for TypeParam {
+    fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
+        write!(f, "{}", self.name(f.db))?;
+        let bounds = f.db.generic_predicates_for_param(self.id);
+        let substs = Substs::type_params(f.db, self.id.parent);
+        let predicates = bounds.iter().cloned().map(|b| b.subst(&substs)).collect::<Vec<_>>();
+        if !(predicates.is_empty() || f.omit_verbose_types()) {
+            write_bounds_like_dyn_trait_with_prefix(":", &predicates, f)?;
+        }
+        Ok(())
+    }
+}