Add tests to ensure that let_chains works with if_let_guard

src/test/ui/rfc-2497-if-let-chains/irrefutable-lets.rs

@@ -1,6 +1,6 @@
 // check-pass
 
-#![feature(let_chains)]
+#![feature(if_let_guard, let_chains)]
 
 use std::ops::Range;
 
@@ -16,6 +16,16 @@ fn main() {
  && let None = local_start {
  }
 
+ match opt {
+ Some(ref first) if let second = first && let _third = second => {},
+ _ => {}
+ }
+ match opt {
+ Some(ref first) if let Range { start: local_start, end: _ } = first
+ && let None = local_start => {},
+ _ => {}
+ }
+
  while let first = &opt && let Some(ref second) = first && let None = second.start {
  }
  while let Some(ref first) = opt && let second = first && let _third = second {

src/test/ui/rfc-2497-if-let-chains/then-else-blocks.rs

@@ -1,6 +1,6 @@
 // run-pass
 
-#![feature(let_chains)]
+#![feature(if_let_guard, let_chains)]
 
 fn check_if_let(opt: Option<Option<Option<i32>>>, value: i32) -> bool {
  if let Some(first) = opt
@@ -15,6 +15,17 @@ fn check_if_let(opt: Option<Option<Option<i32>>>, value: i32) -> bool {
  }
 }
 
+fn check_let_guard(opt: Option<Option<Option<i32>>>, value: i32) -> bool {
+ match opt {
+ Some(first) if let Some(second) = first && let Some(third) = second && third == value => {
+ true
+ }
+ _ => {
+ false
+ }
+ }
+}
+
 fn check_while_let(opt: Option<Option<Option<i32>>>, value: i32) -> bool {
  while let Some(first) = opt
  && let Some(second) = first
@@ -30,6 +41,9 @@ fn main() {
  assert_eq!(check_if_let(Some(Some(Some(1))), 1), true);
  assert_eq!(check_if_let(Some(Some(Some(1))), 9), false);
 
+ assert_eq!(check_let_guard(Some(Some(Some(1))), 1), true);
+ assert_eq!(check_let_guard(Some(Some(Some(1))), 9), false);
+
  assert_eq!(check_while_let(Some(Some(Some(1))), 1), true);
  assert_eq!(check_while_let(Some(Some(Some(1))), 9), false);
 }