bar.rs

#![crate_type = "rlib"]
pub fn bar() {}

foo.ll

; ModuleID = 'foo.cgu-0.rs'
source_filename = "foo.cgu-0.rs"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-gnu"

%A = type {}
%"panic_unwind::windows::EXCEPTION_RECORD" = type { i32, [0 x i8], i32, [0 x i8], %"panic_unwind::windows::EXCEPTION_RECORD"*, [0 x i8], i8*, [0 x i8], i32, [4 x i8], [15 x i8*], [0 x i8] }
%"panic_unwind::windows::CONTEXT" = type {}
%"panic_unwind::windows::DISPATCHER_CONTEXT" = type { i8*, [0 x i8], i8*, [0 x i8], %"panic_unwind::windows::RUNTIME_FUNCTION"*, [0 x i8], i8*, [0 x i8], i8*, [0 x i8], %"panic_unwind::windows::CONTEXT"*, [0 x i8], i8*, [0 x i8], i8*, [0 x i8], %"panic_unwind::windows::UNWIND_HISTORY_TABLE"*, [0 x i8] }
%"panic_unwind::windows::RUNTIME_FUNCTION" = type { i32, [0 x i8], i32, [0 x i8], i32, [0 x i8] }
%"panic_unwind::windows::UNWIND_HISTORY_TABLE" = type {}

; <foo::A as core::ops::drop::Drop>::drop
; Function Attrs: norecurse nounwind readnone uwtable
define void @"_ZN48_$LT$foo..A$u20$as$u20$core..ops..drop..Drop$GT$4drop17hc34d32ad32722cffE"(%A* nocapture) unnamed_addr #0 {
start:
  ret void
}

; foo::foo
; Function Attrs: uwtable
define void @_ZN3foo3foo17h6cb4f4601b3a0374E() unnamed_addr #1 personality i32 (%"panic_unwind::windows::EXCEPTION_RECORD"*, i8*, %"panic_unwind::windows::CONTEXT"*, %"panic_unwind::windows::DISPATCHER_CONTEXT"*)* @rust_eh_personality {
start:
; invoke bar::bar
  invoke void @_ZN3bar3bar17h21868f3a4452d05bE()
          to label %bb2 unwind label %cleanup

bb2:                                              ; preds = %start
  ret void

cleanup:                                          ; preds = %start
  %0 = landingpad { i8*, i32 }
          cleanup
  %.fca.0.extract = extractvalue { i8*, i32 } %0, 0
  tail call void @rust_eh_unwind_resume(i8* %.fca.0.extract)
  unreachable
}

declare i32 @rust_eh_personality(%"panic_unwind::windows::EXCEPTION_RECORD"*, i8*, %"panic_unwind::windows::CONTEXT"*, %"panic_unwind::windows::DISPATCHER_CONTEXT"*) unnamed_addr

; bar::bar
declare void @_ZN3bar3bar17h21868f3a4452d05bE() unnamed_addr

; Function Attrs: noreturn
declare void @rust_eh_unwind_resume(i8*) unnamed_addr #2

attributes #0 = { norecurse nounwind readnone uwtable }
attributes #1 = { uwtable }
attributes #2 = { noreturn }

foo.rs

#![crate_type = "rlib"]
extern crate bar;

struct A;

impl Drop for A {
    fn drop(&mut self) {
    }
}

pub fn foo() {
    let _a = A;
    bar::bar();
}