Basic Block in function [...] does not have terminator!

[carlpaten]

Building CRust-OS/CRust-OS breaks with the following error:

cargo build --target x86_64-unknown-xen
   Compiling crust v0.1.0 (file:///home/carl/crust)
Basic Block in function '_ZN4main20h54d5823f086aab05fVcE' does not have terminator!
label %resume
LLVM ERROR: Broken function found, compilation aborted!
error: Could not compile `crust`.

To learn more, run the command again with --verbose.

To reproduce: multirust update nightly, git clone Crust-OS, make.

Tested on the following versions:

rustc 1.9.0-nightly (02310fd31 2016-03-19)
rustc 1.9.0-nightly (21922e1f4 2016-03-21)

[alexcrichton]

Reduced down to this:

#![feature(lang_items)]                                
#![feature(alloc)]                                     
#![no_std]                                             

extern crate alloc;                                    

use alloc::boxed::Box;                                 

pub fn foo(s: Box<i32>) {                              
    bar();                                             
}                                                      

pub fn bar() {}                                        

#[lang = "eh_unwind_resume"]                           
pub unsafe extern fn eh_unwind_resume(_args: *mut u8) {
}                                                      

I believe the fix is to have the eh_unwind_resume function return ! and then make it just loop {} (or compile with -Z no-landing-pads)

Otherwise the assert is covered by #9307, so I'm gonna close in favor of that. Thanks for the report though!