From 9a5b9962283ed432cf98c8aff9db3104c18209a8 Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Mon, 2 Sep 2019 23:26:04 +0900
Subject: [PATCH] Allow deref_addrof in macros

---
 clippy_lints/src/reference.rs  |  3 ++-
 tests/ui/deref_addrof_macro.rs | 10 ++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 tests/ui/deref_addrof_macro.rs

diff --git a/clippy_lints/src/reference.rs b/clippy_lints/src/reference.rs
index 35e214faae8..54582c6015c 100644
--- a/clippy_lints/src/reference.rs
+++ b/clippy_lints/src/reference.rs
@@ -1,4 +1,4 @@
-use crate::utils::{snippet_with_applicability, span_lint_and_sugg};
+use crate::utils::{in_macro, snippet_with_applicability, span_lint_and_sugg};
 use if_chain::if_chain;
 use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
@@ -38,6 +38,7 @@ impl EarlyLintPass for DerefAddrOf {
         if_chain! {
             if let ExprKind::Unary(UnOp::Deref, ref deref_target) = e.node;
             if let ExprKind::AddrOf(_, ref addrof_target) = without_parens(deref_target).node;
+            if !in_macro(addrof_target.span);
             then {
                 let mut applicability = Applicability::MachineApplicable;
                 span_lint_and_sugg(
diff --git a/tests/ui/deref_addrof_macro.rs b/tests/ui/deref_addrof_macro.rs
new file mode 100644
index 00000000000..dcebd6c6e29
--- /dev/null
+++ b/tests/ui/deref_addrof_macro.rs
@@ -0,0 +1,10 @@
+macro_rules! m {
+    ($($x:tt),*) => { &[$(($x, stringify!(x)),)*] };
+}
+
+#[warn(clippy::deref_addrof)]
+fn f() -> [(i32, &'static str); 3] {
+    *m![1, 2, 3] // should be fine
+}
+
+fn main() {}