diff --git a/src/librustc_passes/region.rs b/src/librustc_passes/region.rs
index b828e014cfc9..7630e3e8950c 100644
--- a/src/librustc_passes/region.rs
+++ b/src/librustc_passes/region.rs
@@ -512,6 +512,7 @@ fn resolve_local<'tcx>(
 
     /// Returns `true` if `pat` match the `P&` non-terminal.
     ///
+    /// ```text
     ///     P& = ref X
     ///        | StructName { ..., P&, ... }
     ///        | VariantName(..., P&, ...)
@@ -519,6 +520,7 @@ fn resolve_local<'tcx>(
     ///        | ( ..., P&, ... )
     ///        | ... "|" P& "|" ...
     ///        | box P&
+    /// ```
     fn is_binding_pat(pat: &hir::Pat<'_>) -> bool {
         // Note that the code below looks for *explicit* refs only, that is, it won't
         // know about *implicit* refs as introduced in #42640.
@@ -575,6 +577,7 @@ fn resolve_local<'tcx>(
 
     /// If `expr` matches the `E&` grammar, then records an extended rvalue scope as appropriate:
     ///
+    /// ```text
     ///     E& = & ET
     ///        | StructName { ..., f: E&, ... }
     ///        | [ ..., E&, ... ]
@@ -583,6 +586,7 @@ fn resolve_local<'tcx>(
     ///        | box E&
     ///        | E& as ...
     ///        | ( E& )
+    /// ```
     fn record_rvalue_scope_if_borrow_expr<'tcx>(
         visitor: &mut RegionResolutionVisitor<'tcx>,
         expr: &hir::Expr<'_>,
@@ -623,11 +627,13 @@ fn resolve_local<'tcx>(
     /// More formally, if `expr` matches the grammar `ET`, record the rvalue scope of the matching
     /// `<rvalue>` as `blk_id`:
     ///
+    /// ```text
     ///     ET = *ET
     ///        | ET[...]
     ///        | ET.f
     ///        | (ET)
     ///        | <rvalue>
+    /// ```
     ///
     /// Note: ET is intended to match "rvalues or places based on rvalues".
     fn record_rvalue_scope<'tcx>(