From 3715245a3688de8f82ffbb127b09a0dd517458c3 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Wed, 26 Dec 2018 16:23:04 +0100
Subject: [PATCH] add test for offseting fn ptr

---
 tests/run-pass/ptr_offset.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/run-pass/ptr_offset.rs b/tests/run-pass/ptr_offset.rs
index 6add5212db9..9e2e26fad36 100644
--- a/tests/run-pass/ptr_offset.rs
+++ b/tests/run-pass/ptr_offset.rs
@@ -1,6 +1,16 @@
+fn f() -> i32 { 42 }
+
 fn main() {
     let v = [1i16, 2];
     let x = &v as *const i16;
     let x = unsafe { x.offset(1) };
     assert_eq!(unsafe { *x }, 2);
+
+    // fn ptr offset
+    unsafe {
+        let p = f as fn() -> i32 as usize;
+        let x = (p as *mut u32).offset(0) as usize;
+        let f: fn() -> i32 = std::mem::transmute(x);
+        assert_eq!(f(), 42);
+    }
 }