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-rw-r--r--src/librustc_middle/ty/subst.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/librustc_middle/ty/subst.rs b/src/librustc_middle/ty/subst.rs
index fd31adae499..e9fd67a748c 100644
--- a/src/librustc_middle/ty/subst.rs
+++ b/src/librustc_middle/ty/subst.rs
@@ -336,8 +336,10 @@ impl<'a, 'tcx> InternalSubsts<'tcx> {
     ///
     /// For example given:
     ///
+    /// ```no_run
     /// trait X<S> { fn f<T>(); }
     /// impl<U> X<U> for U { fn f<V>() {} }
+    /// ```
     ///
     /// * If `self` is `[Self, S, T]`: the identity substs of `f` in the trait.
     /// * If `source_ancestor` is the def_id of the trait.