llvm-project/llvm/test/Linker/redefinition.ll

; Test linking two functions with different prototypes and two globals 
; in different modules.
; RUN: llvm-as %s -o %t.foo1.bc -f
; RUN: llvm-as %s -o %t.foo2.bc -f
; RUN: echo {define void @foo(i32 %x) { ret void }} | llvm-as -o %t.foo3.bc -f
; RUN: ignore llvm-link %t.foo1.bc %t.foo2.bc -o %t.bc |& \
; RUN:   grep {Function is already defined}
; RUN: ignore llvm-link %t.foo1.bc %t.foo3.bc -o %t.bc |& \
; RUN:   grep {Function 'foo' defined as both}
define void @foo() { ret void }