"builtin.module"() ({
  "func.func"() <{
    function_type = (!secret.secret<i16>) -> (!secret.secret<i16>, !secret.secret<i16>),
    sym_name = "multi_output"
  }> ({
  ^bb0(%arg0: !secret.secret<i16>):
    %0 = "arith.constant"() <{value = 2 : i16}> : () -> i16
    %1:2 = "secret.generic"(%arg0) ({
    ^bb0(%arg1: i16):
      %2 = "arith.muli"(%arg1, %0) : (i16, i16) -> i16
      "secret.yield"(%2, %2) : (i16, i16) -> ()
    }) : (!secret.secret<i16>) -> (!secret.secret<i16>, !secret.secret<i16>)
    "func.return"(%1#0, %1#1) : (!secret.secret<i16>, !secret.secret<i16>) -> ()
  }) : () -> ()
}) : () -> ()

heir-opt --secret-to-mod-arith=modulus=17 test.mlir

heir-opt: external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:2074: virtual void mlir::ConversionPatternRewriter::replaceOp(Operation *, ValueRange): Assertion `op->getNumResults() == newValues.size() && "incorrect # of replacement values"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0.      Program arguments: /workdir/heir/bin/heir-opt --secret-to-mod-arith=modulus=17 test.mlir
 #0 0x00005612c75b29c6 ___interceptor_backtrace (/workdir/heir/bin/heir-opt+0x5b549c6)
 #1 0x00005612d2d6b1c2 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /proc/self/cwd/external/llvm-project/llvm/lib/Support/Unix/Signals.inc:838:8
 #2 0x00005612d2d6c001 llvm::sys::RunSignalHandlers() /proc/self/cwd/external/llvm-project/llvm/lib/Support/Signals.cpp:105:18
 #3 0x00005612d2d6c001 SignalHandler(int, siginfo_t*, void*) /proc/self/cwd/external/llvm-project/llvm/lib/Support/Unix/Signals.inc:409:3
 #4 0x00007fc4841b7520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #5 0x00007fc48420b9fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #6 0x00007fc4841b7476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #7 0x00007fc48419d7f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #8 0x00007fc48419d71b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #9 0x00007fc4841aee96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#10 0x00005612d17d5a53 mlir::ConversionPatternRewriter::replaceOp(mlir::Operation*, mlir::ValueRange) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:2075:3
#11 0x00005612d17d4ed5 mlir::ConversionPatternRewriter::replaceOp(mlir::Operation*, mlir::Operation*) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:2070:1
#12 0x00005612c7b27700 mlir::heir::SecretGenericOpCipherPlainConversion<mlir::arith::MulIOp, mlir::heir::mod_arith::MulOp>::matchAndRewriteInner(mlir::heir::secret::GenericOp, mlir::TypeRange, mlir::ValueRange, mlir::ConversionPatternRewriter&) const /proc/self/cwd/lib/Dialect/Secret/Conversions/SecretToModArith/SecretToModArith.cpp:348:3
#13 0x00005612c7b2708c mlir::heir::SecretGenericOpConversion<mlir::arith::MulIOp, mlir::heir::mod_arith::MulOp>::matchAndRewrite(mlir::heir::secret::GenericOp, mlir::heir::secret::GenericOpAdaptor, mlir::ConversionPatternRewriter&) const /proc/self/cwd/lib/Dialect/Secret/Conversions/SecretToModArith/SecretToModArith.cpp:130:9
#14 0x00005612c77356c1 llvm::LogicalResult mlir::ConversionPattern::dispatchTo1To1<mlir::OpConversionPattern<mlir::heir::secret::GenericOp>, mlir::heir::secret::GenericOp>(mlir::OpConversionPattern<mlir::heir::secret::GenericOp> const&, mlir::heir::secret::GenericOp, mlir::heir::secret::GenericOp::GenericAdaptor<llvm::ArrayRef<mlir::ValueRange> >, mlir::ConversionPatternRewriter&) /proc/self/cwd/external/llvm-project/mlir/include/mlir/Transforms/DialectConversion.h:1025:15
#15 0x00005612c77353b3 mlir::OpConversionPattern<mlir::heir::secret::GenericOp>::matchAndRewrite(mlir::heir::secret::GenericOp, mlir::heir::secret::GenericOpGenericAdaptor<llvm::ArrayRef<mlir::ValueRange> >, mlir::ConversionPatternRewriter&) const /proc/self/cwd/external/llvm-project/mlir/include/mlir/Transforms/DialectConversion.h:727:12
#16 0x00005612c7735005 mlir::OpConversionPattern<mlir::heir::secret::GenericOp>::matchAndRewrite(mlir::Operation*, llvm::ArrayRef<mlir::ValueRange>, mlir::ConversionPatternRewriter&) const /proc/self/cwd/external/llvm-project/mlir/include/mlir/Transforms/DialectConversion.h:713:12
#17 0x00005612d17dc771 mlir::ConversionPattern::matchAndRewrite(mlir::Operation*, mlir::PatternRewriter&) const /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:0:10
#18 0x00005612d190b112 mlir::PatternApplicator::matchAndRewrite(mlir::Operation*, mlir::PatternRewriter&, llvm::function_ref<bool (mlir::Pattern const&)>, llvm::function_ref<void (mlir::Pattern const&)>, llvm::function_ref<llvm::LogicalResult (mlir::Pattern const&)>)::$_0::operator()() const /proc/self/cwd/external/llvm-project/mlir/lib/Rewrite/PatternApplicator.cpp:0:31
#19 0x00005612d190b112 void llvm::function_ref<void ()>::callback_fn<mlir::PatternApplicator::matchAndRewrite(mlir::Operation*, mlir::PatternRewriter&, llvm::function_ref<bool (mlir::Pattern const&)>, llvm::function_ref<void (mlir::Pattern const&)>, llvm::function_ref<llvm::LogicalResult (mlir::Pattern const&)>)::$_0>(long) /proc/self/cwd/external/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:46:12
#20 0x00005612d1907375 mlir::PatternApplicator::matchAndRewrite(mlir::Operation*, mlir::PatternRewriter&, llvm::function_ref<bool (mlir::Pattern const&)>, llvm::function_ref<void (mlir::Pattern const&)>, llvm::function_ref<llvm::LogicalResult (mlir::Pattern const&)>) /proc/self/cwd/external/llvm-project/mlir/lib/Rewrite/PatternApplicator.cpp:197:5
#21 0x00005612d17e0c5c (anonymous namespace)::OperationLegalizer::legalizeWithPattern(mlir::Operation*) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:2767:21
#22 0x00005612d17e0c5c (anonymous namespace)::OperationLegalizer::legalize(mlir::Operation*) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:2533:17
#23 0x00005612d17df170 mlir::OperationConverter::convert(mlir::Operation*) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:3288:7
#24 0x00005612d17e1a80 mlir::OperationConverter::convertOperations(llvm::ArrayRef<mlir::Operation*>) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:3385:0
#25 0x00005612d18025af applyConversion(llvm::ArrayRef<mlir::Operation*>, mlir::ConversionTarget const&, mlir::FrozenRewritePatternSet const&, mlir::ConversionConfig, (anonymous namespace)::OpConversionMode)::$_0::operator()() const /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:4107:9
#26 0x00005612d18025af void llvm::function_ref<void ()>::callback_fn<applyConversion(llvm::ArrayRef<mlir::Operation*>, mlir::ConversionTarget const&, mlir::FrozenRewritePatternSet const&, mlir::ConversionConfig, (anonymous namespace)::OpConversionMode)::$_0>(long) /proc/self/cwd/external/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:46:12
#27 0x00005612d17ef633 applyConversion(llvm::ArrayRef<mlir::Operation*>, mlir::ConversionTarget const&, mlir::FrozenRewritePatternSet const&, mlir::ConversionConfig, (anonymous namespace)::OpConversionMode) /proc/self/cwd/external/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:0:12
#28 0x00005612d17ef95a mlir::applyPartialConversion(llvm::ArrayRef<mlir::Operation*>, mlir::ConversionTarget const&, mlir::FrozenRewritePatternSet const&, mlir::ConversionConfig) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:4120:10
#29 0x00005612d17ef95a mlir::applyPartialConversion(mlir::Operation*, mlir::ConversionTarget const&, mlir::FrozenRewritePatternSet const&, mlir::ConversionConfig) /proc/self/cwd/external/llvm-project/mlir/lib/Transforms/Utils/DialectConversion.cpp:4127:10
#30 0x00005612c7b210d8 mlir::heir::SecretToModArith::runOnOperation() /proc/self/cwd/lib/Dialect/Secret/Conversions/SecretToModArith/SecretToModArith.cpp:421:16
...
#47 0x00005612cb167b99 mlir::MlirOptMain(int, char**, llvm::StringRef, llvm::StringRef, mlir::DialectRegistry&) /proc/self/cwd/external/llvm-project/mlir/lib/Tools/mlir-opt/MlirOptMain.cpp:784:0
#48 0x00005612cb1683ce mlir::MlirOptMain(int, char**, llvm::StringRef, mlir::DialectRegistry&) /proc/self/cwd/external/llvm-project/mlir/lib/Tools/mlir-opt/MlirOptMain.cpp:800:10
#49 0x00005612c764ebe1 mlir::asMainReturnCode(llvm::LogicalResult) /proc/self/cwd/external/llvm-project/mlir/include/mlir/Tools/mlir-opt/MlirOptMain.h:0:0
#50 0x00005612c764ebe1 main /proc/self/cwd/tools/heir-opt.cpp:463:10
#51 0x00007fc48419ed90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#52 0x00007fc48419ee40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#53 0x00005612c756c025 _start (/workdir/heir/bin/heir-opt+0x5b0e025)
Aborted