fix: indentation issue on generic bounds

src/types.rs

@@ -936,7 +936,7 @@ fn join_bounds_inner(
                 _ => false,
             };
 
-            let shape = if i > 0 && need_indent && force_newline {
+            let shape = if need_indent && force_newline {
                 shape
                     .block_indent(context.config.tab_spaces())
                     .with_max_width(context.config)

tests/source/issue_4636.rs

@@ -0,0 +1,13 @@
+pub trait PrettyPrinter<'tcx>:
+    Printer<
+        'tcx,
+        Error = fmt::Error,
+        Path = Self,
+        Region = Self,
+        Type = Self,
+        DynExistential = Self,
+        Const = Self,
+    > + fmt::Write
+    {
+         //
+    }

tests/target/issue_4636.rs

@@ -0,0 +1,13 @@
+pub trait PrettyPrinter<'tcx>:
+    Printer<
+        'tcx,
+        Error = fmt::Error,
+        Path = Self,
+        Region = Self,
+        Type = Self,
+        DynExistential = Self,
+        Const = Self,
+    > + fmt::Write
+{
+    //
+}