Merge from rustc

Author: The rustc-dev-guide Cronjob Bot

src/lib.rs

@@ -1,6 +1,5 @@
 #![feature(rustc_private)]
 #![feature(cfg_match)]
-#![feature(cell_update)]
 #![feature(float_gamma)]
 #![feature(float_erf)]
 #![feature(map_try_insert)]

tests/fail/panic/tls_macro_const_drop_panic.stderr

@@ -1,7 +1,7 @@
 
 thread $NAME panicked at tests/fail/panic/tls_macro_const_drop_panic.rs:LL:CC:
 ow
-fatal runtime error: thread local panicked on drop
+fatal runtime error: thread local panicked on drop, aborting
 error: abnormal termination: the program aborted execution
 
 error: aborting due to 1 previous error

tests/fail/panic/tls_macro_drop_panic.stderr

@@ -1,7 +1,7 @@
 
 thread $NAME panicked at tests/fail/panic/tls_macro_drop_panic.rs:LL:CC:
 ow
-fatal runtime error: thread local panicked on drop
+fatal runtime error: thread local panicked on drop, aborting
 error: abnormal termination: the program aborted execution
 
 error: aborting due to 1 previous error

tests/pass/fn_align.rs

@@ -0,0 +1,21 @@
+//@compile-flags: -Zmin-function-alignment=8
+#![feature(fn_align)]
+
+// When a function uses `repr(align(N))`, the function address should be a multiple of `N`.
+
+#[repr(align(256))]
+fn foo() {}
+
+#[repr(align(16))]
+fn bar() {}
+
+#[repr(align(4))]
+fn baz() {}
+
+fn main() {
+    assert!((foo as usize).is_multiple_of(256));
+    assert!((bar as usize).is_multiple_of(16));
+
+    // The maximum of `repr(align(N))` and `-Zmin-function-alignment=N` is used.
+    assert!((baz as usize).is_multiple_of(8));
+}