1 files changed, 30 insertions, 0 deletions
diff --git a/vendor/chalk-solve-0.87.0/src/display/render_trait.rs b/vendor/chalk-solve-0.87.0/src/display/render_trait.rs
new file mode 100644
index 000000000..a565f076c
--- /dev/null
+++ b/vendor/chalk-solve-0.87.0/src/display/render_trait.rs
@@ -0,0 +1,30 @@
+//! `RenderAsRust` trait and related utils.
+use std::fmt::{Display, Formatter, Result};
+
+use chalk_ir::interner::Interner;
+
+use super::state::InternalWriterState;
+
+/// Displays `RenderAsRust` data.
+///
+/// This is a utility struct for making `RenderAsRust` nice to use with rust format macros.
+pub(in crate::display) struct DisplayRenderAsRust<'a, I: Interner, T> {
+    s: &'a InternalWriterState<'a, I>,
+    rar: &'a T,
+}
+
+impl<I: Interner, T: RenderAsRust<I>> Display for DisplayRenderAsRust<'_, I, T> {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+        self.rar.fmt(self.s, f)
+    }
+}
+
+pub(in crate::display) trait RenderAsRust<I: Interner> {
+    fn fmt(&self, s: &InternalWriterState<'_, I>, f: &mut Formatter<'_>) -> Result;
+    fn display<'a>(&'a self, s: &'a InternalWriterState<'a, I>) -> DisplayRenderAsRust<'a, I, Self>
+    where
+        Self: Sized,
+    {
+        DisplayRenderAsRust { s, rar: self }
+    }
+}