From 24a2c14733604132135b2ab598e7a1cf95d8b3ab Mon Sep 17 00:00:00 2001
From: Alex Burka <aburka@seas.upenn.edu>
Date: Mon, 23 Oct 2017 15:20:58 -0400
Subject: [PATCH] remove if_let_chain

---
 clippy_lints/Cargo.toml       |  1 +
 clippy_lints/src/lib.rs       |  5 +++
 clippy_lints/src/utils/mod.rs | 57 -----------------------------------
 3 files changed, 6 insertions(+), 57 deletions(-)

diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml
index 414cd68a660..2dcac941c09 100644
--- a/clippy_lints/Cargo.toml
+++ b/clippy_lints/Cargo.toml
@@ -28,6 +28,7 @@ toml = "0.4"
 unicode-normalization = "0.1"
 pulldown-cmark = "0.0.15"
 url = "1.5.0"
+if_chain = "0.1"
 
 [features]
 debugging = []
diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 27ef37dd00f..1cd3479f11d 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -11,6 +11,8 @@
 #![feature(inclusive_range_syntax, range_contains)]
 #![allow(unknown_lints, indexing_slicing, shadow_reuse, missing_docs_in_private_items)]
 
+#![recursion_limit="256"]
+
 #[macro_use]
 extern crate rustc;
 extern crate rustc_typeck;
@@ -54,6 +56,9 @@ extern crate itertools;
 extern crate pulldown_cmark;
 extern crate url;
 
+#[macro_use]
+extern crate if_chain;
+
 macro_rules! declare_restriction_lint {
     { pub $name:tt, $description:tt } => {
         declare_lint! { pub $name, Allow, $description }
diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index 9bc87dee68c..e0ed6689458 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -37,63 +37,6 @@ pub use self::hir_utils::{SpanlessEq, SpanlessHash};
 
 pub type MethodArgs = HirVec<P<Expr>>;
 
-/// Produce a nested chain of if-lets and ifs from the patterns:
-///
-/// ```rust,ignore
-/// if_let_chain! {[
-///     let Some(y) = x,
-///     y.len() == 2,
-///     let Some(z) = y,
-/// ], {
-///     block
-/// }}
-/// ```
-///
-/// becomes
-///
-/// ```rust,ignore
-/// if let Some(y) = x {
-///     if y.len() == 2 {
-///         if let Some(z) = y {
-///             block
-///         }
-///     }
-/// }
-/// ```
-#[macro_export]
-macro_rules! if_let_chain {
-    ([let $pat:pat = $expr:expr, $($tt:tt)+], $block:block) => {
-        if let $pat = $expr {
-           if_let_chain!{ [$($tt)+], $block }
-        }
-    };
-    ([let $pat:pat = $expr:expr], $block:block) => {
-        if let $pat = $expr {
-           $block
-        }
-    };
-    ([let $pat:pat = $expr:expr,], $block:block) => {
-        if let $pat = $expr {
-           $block
-        }
-    };
-    ([$expr:expr, $($tt:tt)+], $block:block) => {
-        if $expr {
-           if_let_chain!{ [$($tt)+], $block }
-        }
-    };
-    ([$expr:expr], $block:block) => {
-        if $expr {
-           $block
-        }
-    };
-    ([$expr:expr,], $block:block) => {
-        if $expr {
-           $block
-        }
-    };
-}
-
 pub mod higher;
 
 /// Returns true if the two spans come from differing expansions (i.e. one is