# A forward declaration of `X` nested under DW_TAG_module M, plus a real
# definition of `X` in another CU. The parallel linker routes both
# through the type pool, so allocateTypeDie's def-wins resolution plus
# getFinalDie emit only the canonical definition under the module.

RUN: rm -rf %t && mkdir -p %t
RUN: llc -O0 -mtriple=x86_64-apple-darwin -filetype=obj \
RUN:     -o %t/1.o %p/../Inputs/drop-module-fwd-decl/input.ll
RUN: dsymutil --linker parallel -f \
RUN:     -y %p/../Inputs/drop-module-fwd-decl/debug-map.map \
RUN:     -oso-prepend-path %t -o - 2>/dev/null \
RUN:   | llvm-dwarfdump --debug-info - | FileCheck %s

# The artificial type unit holds DW_TAG_module M with the full definition
# of X nested inside (not a forward decl).
CHECK:      DW_AT_name {{.*}}"__artificial_type_unit"
CHECK:      DW_TAG_module
CHECK-NEXT:   DW_AT_name {{.*}}"M"
CHECK:      DW_TAG_structure_type
CHECK-NEXT:   DW_AT_name {{.*}}"X"
CHECK-NEXT:   DW_AT_byte_size

# No DW_AT_declaration anywhere in the linked output. The only declaration
# in the input was the forward decl; if the dedup regresses it will
# reappear here as a DW_TAG_structure_type X with DW_AT_declaration.
CHECK-NOT:  DW_AT_declaration