Bump rust-by-example submodule

faern · faern · commit d0a78ea94ae2 · 2020-04-06T22:14:35.000+02:00
diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit edd2a7e687358712608896730c083cb76c7b401a
+Subproject commit a6638463efc7631bc0e8dc67ccd256d4e1b61f1a
