// RUN: cir-opt %s -cir-call-conv-lowering="classification-attr=test_classify" \
// RUN:   | FileCheck %s

// Function declarations (no body) get their signature rewritten just like
// definitions: arg list is updated, return type is updated, but no body
// adaptation runs.

!s32i = !cir.int<s, 32>

#ignore_first_arg = {
  return = { kind = "direct" },
  args   = [ { kind = "ignore" }, { kind = "direct" } ]
}

module attributes {
  dlti.dl_spec = #dlti.dl_spec<#dlti.dl_entry<i32, dense<32>: vector<2xi64>>>
} {

  cir.func private @ext_decl(!s32i, !s32i) -> !s32i
      attributes { test_classify = #ignore_first_arg }

  // The first argument type is dropped from the declaration's signature.
  // CHECK:      cir.func{{.*}} @ext_decl(!s32i) -> !s32i

  cir.func @caller(%arg0: !s32i, %arg1: !s32i) -> !s32i
      attributes { test_classify = #ignore_first_arg } {
    %0 = cir.call @ext_decl(%arg0, %arg1) : (!s32i, !s32i) -> !s32i
    cir.return %0 : !s32i
  }

  // CHECK:      cir.func{{.*}} @caller(%arg0: !s32i) -> !s32i
  // CHECK:        %[[R:.*]] = cir.call @ext_decl(%arg0) : (!s32i) -> !s32i

}