Auto merge of #3811 - rust-lang:test-for-2526, r=mcarton

Add a test for #2526 Closes #2526, which seems to have been fixed at some point, but I couldn't find a test for it.
rust-lang · Feb 24, 2019 · e99611b · e99611b
2 parents 5833e4d + 8bcd546
commit e99611b
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diff --git a/tests/ui/proc_macro.rs 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
@@ -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
+