From bd18ad4fef9ca3d618521b8268183497b6104ff9 Mon Sep 17 00:00:00 2001
From: jumbatm <jumbatm@gmail.com>
Date: Fri, 1 May 2020 21:49:42 +1000
Subject: [PATCH] Note that try_validation_pat can take a format str directly.

---
 src/librustc_mir/interpret/validity.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/librustc_mir/interpret/validity.rs b/src/librustc_mir/interpret/validity.rs
index 54da0ba9eed..fe584596f01 100644
--- a/src/librustc_mir/interpret/validity.rs
+++ b/src/librustc_mir/interpret/validity.rs
@@ -66,6 +66,15 @@ macro_rules! try_validation {
 /// });
 /// ```
 ///
+/// An additional nicety is that both parameters actually take format args, so you can just write
+/// the format string in directly:
+///
+/// ```
+/// let v = try_validation_pat!(some_fn(), some_path, {
+///     Foo | Bar | Baz => { "{:?}", some_failure } expected { "{}", expected_value },
+/// });
+/// ```
+///
 macro_rules! try_validation_pat {
     ($e:expr, $where:expr, { $( $p:pat )|+ =>
         { $( $what_fmt:expr ),+ } $( expected { $( $expected_fmt:expr ),+ } )? $( , )?}) => {{