Rolling up PRs in the queue

Closes #14797 (librustc: Fix the issue with labels shadowing variable names by making)
Closes #14823 (Improve error messages for io::fs)
Closes #14827 (libsyntax: Allow `+` to separate trait bounds from objects.)
Closes #14834 (configure: Don't sync unused submodules)
Closes #14838 (Remove typo on collections::treemap::UnionItems)
Closes #14839 (Fix the unused struct field lint for struct variants)
Closes #14840 (Clarify `Any` docs)
Closes #14846 (rustc: [T, ..N] and [T, ..N+1] are not the same)
Closes #14847 (Audit usage of NativeMutex)
Closes #14850 (remove unnecessary PaX detection)
Closes #14856 (librustc: Take in account mutability when casting array to raw ptr.)
Closes #14859 (librustc: Forbid `transmute` from being called on types whose size is)
Closes #14860 (Fix `quote_pat!` & parse outer attributes in `quote_item!`)

1 files changed, 4 insertions, 4 deletions

diff --git a/src/libstd/rt/backtrace.rs b/src/libstd/rt/backtrace.rs
index a1372b51d47..e2a963c5a87 100644
--- a/src/libstd/rt/backtrace.rs
+++ b/src/libstd/rt/backtrace.rs
@@ -873,12 +873,12 @@ mod imp {
             Err(..) => return Ok(()),
         };
 
-        macro_rules! sym( ($e:expr, $t:ident) => (
-            match unsafe { lib.symbol::<$t>($e) } {
-                Ok(f) => f,
+        macro_rules! sym( ($e:expr, $t:ident) => (unsafe {
+            match lib.symbol($e) {
+                Ok(f) => mem::transmute::<*u8, $t>(f),
                 Err(..) => return Ok(())
             }
-        ) )
+        }) )
 
         // Fetch the symbols necessary from dbghelp.dll
         let SymFromAddr = sym!("SymFromAddr", SymFromAddrFn);