From 8bcd546648d9ed16659d571380f41f3fbf7e0a47 Mon Sep 17 00:00:00 2001
From: mcarton <cartonmartin+git@gmail.com>
Date: Sun, 24 Feb 2019 15:59:58 +0100
Subject: [PATCH] Add a test for #2526

---
 tests/ui/proc_macro.rs     |  8 ++++++++
 tests/ui/proc_macro.stderr | 10 ++++++++++
 2 files changed, 18 insertions(+)
 create mode 100755 tests/ui/proc_macro.rs
 create mode 100644 tests/ui/proc_macro.stderr

diff --git a/tests/ui/proc_macro.rs b/tests/ui/proc_macro.rs
new file mode 100755
index 00000000000..dd8bd58c015
--- /dev/null
+++ b/tests/ui/proc_macro.rs
@@ -0,0 +1,8 @@
+//! Check that we correctly lint procedural macros.
+
+#![crate_type = "proc-macro"]
+
+#[allow(dead_code)]
+fn f() {
+    let _x = 3.14;
+}
diff --git a/tests/ui/proc_macro.stderr b/tests/ui/proc_macro.stderr
new file mode 100644
index 00000000000..ec19cd8fc5f
--- /dev/null
+++ b/tests/ui/proc_macro.stderr
@@ -0,0 +1,10 @@
+error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
+  --> $DIR/proc_macro.rs:7:14
+   |
+LL |     let _x = 3.14;
+   |              ^^^^
+   |
+   = note: #[deny(clippy::approx_constant)] on by default
+
+error: aborting due to previous error
+