Rework precise capturing syntax

compiler/rustc_hir_pretty/src/lib.rs

@@ -13,7 +13,7 @@ use rustc_ast_pretty::pprust::{Comments, PrintState};
 use rustc_hir as hir;
 use rustc_hir::{
     BindingMode, ByRef, GenericArg, GenericBound, GenericParam, GenericParamKind, HirId,
-    LifetimeParamKind, Node, PatKind, RangeEnd, Term, TraitBoundModifier,
+    LifetimeParamKind, Node, PatKind, PreciseCapturingArg, RangeEnd, Term, TraitBoundModifier,
 };
 use rustc_span::source_map::SourceMap;
 use rustc_span::symbol::{kw, Ident, Symbol};
@@ -2100,10 +2100,24 @@ impl<'a> State<'a> {
                 GenericBound::Outlives(lt) => {
                     self.print_lifetime(lt);
                 }
+                GenericBound::Use(args, _) => {
+                    self.word("use <");
+
+                    self.commasep(Inconsistent, args, |s, arg| s.print_precise_capturing_arg(*arg));
+
+                    self.word(">");
+                }
             }
         }
     }
 
+    fn print_precise_capturing_arg(&mut self, arg: PreciseCapturingArg<'_>) {
+        match arg {
+            PreciseCapturingArg::Lifetime(lt) => self.print_lifetime(lt),
+            PreciseCapturingArg::Param(arg) => self.print_ident(arg.ident),
+        }
+    }
+
     fn print_generic_params(&mut self, generic_params: &[GenericParam<'_>]) {
         if !generic_params.is_empty() {
             self.word("<");