// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/bool.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/if/basics.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if/basics.carbon

// --- else.carbon
library "[[@TEST_NAME]]";

fn F() {}
fn G() {}
fn H() {}

//@dump-sem-ir-begin
fn If(b: bool) {
  if (b) {
    F();
  } else {
    G();
  }
  H();
}
//@dump-sem-ir-end

// --- no_else.carbon
library "[[@TEST_NAME]]";

fn F() {}
fn G() {}

//@dump-sem-ir-begin
fn If(b: bool) {
  if (b) {
    F();
  }
  G();
}
//@dump-sem-ir-end

// --- unreachable_fallthrough.carbon
library "[[@TEST_NAME]]";

//@dump-sem-ir-begin
fn If(b: bool) -> bool {
  if (b) {
    return false;
  } else {
    return true;
  }
  // Missing return here is OK.
}
//@dump-sem-ir-end

// --- fail_reachable_fallthrough.carbon
library "[[@TEST_NAME]]";

fn If1(b: bool) -> bool {
  if (b) {
    return false;
  } else {
  }
// CHECK:STDERR: fail_reachable_fallthrough.carbon:[[@LINE+4]]:1: error: missing `return` at end of function with declared return type [MissingReturnStatement]
// CHECK:STDERR: }
// CHECK:STDERR: ^
// CHECK:STDERR:
}

fn If2(b: bool) -> bool {
  if (b) {
  } else {
    return true;
  }
// CHECK:STDERR: fail_reachable_fallthrough.carbon:[[@LINE+4]]:1: error: missing `return` at end of function with declared return type [MissingReturnStatement]
// CHECK:STDERR: }
// CHECK:STDERR: ^
// CHECK:STDERR:
}

fn If3(b: bool) -> bool {
  if (b) {
    return false;
  }
// CHECK:STDERR: fail_reachable_fallthrough.carbon:[[@LINE+4]]:1: error: missing `return` at end of function with declared return type [MissingReturnStatement]
// CHECK:STDERR: }
// CHECK:STDERR: ^
// CHECK:STDERR:
}

// --- fail_scope.carbon
library "[[@TEST_NAME]]";

fn VarScope(b: bool) -> bool {
  if (b) {
    var n: bool = true;
    return n;
  }
  // CHECK:STDERR: fail_scope.carbon:[[@LINE+4]]:10: error: name `n` not found [NameNotFound]
  // CHECK:STDERR:   return n;
  // CHECK:STDERR:          ^
  // CHECK:STDERR:
  return n;
}

// CHECK:STDOUT: --- else.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT:   %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT:   %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT:   %H.type: type = fn_type @H [concrete]
// CHECK:STDOUT:   %H: %H.type = struct_value () [concrete]
// CHECK:STDOUT:   %Bool.type: type = fn_type @Bool [concrete]
// CHECK:STDOUT:   %Bool: %Bool.type = struct_value () [concrete]
// CHECK:STDOUT:   %pattern_type.831: type = pattern_type bool [concrete]
// CHECK:STDOUT:   %If.type: type = fn_type @If [concrete]
// CHECK:STDOUT:   %If: %If.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %If.decl: %If.type = fn_decl @If [concrete = constants.%If] {
// CHECK:STDOUT:     %b.patt: %pattern_type.831 = value_binding_pattern b [concrete]
// CHECK:STDOUT:     %b.param_patt: %pattern_type.831 = value_param_pattern %b.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %b.param: bool = value_param call_param0
// CHECK:STDOUT:     %.loc8_10.1: type = splice_block %.loc8_10.3 [concrete = bool] {
// CHECK:STDOUT:       %Bool.call: init type = call constants.%Bool() [concrete = bool]
// CHECK:STDOUT:       %.loc8_10.2: type = value_of_initializer %Bool.call [concrete = bool]
// CHECK:STDOUT:       %.loc8_10.3: type = converted %Bool.call, %.loc8_10.2 [concrete = bool]
// CHECK:STDOUT:     }
// CHECK:STDOUT:     %b: bool = value_binding b, %b.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @If(%b.param: bool) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %b.ref: bool = name_ref b, %b
// CHECK:STDOUT:   if %b.ref br !if.then else br !if.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then:
// CHECK:STDOUT:   %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT:   %F.call: init %empty_tuple.type = call %F.ref()
// CHECK:STDOUT:   br !if.done
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else:
// CHECK:STDOUT:   %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT:   %G.call: init %empty_tuple.type = call %G.ref()
// CHECK:STDOUT:   br !if.done
// CHECK:STDOUT:
// CHECK:STDOUT: !if.done:
// CHECK:STDOUT:   %H.ref: %H.type = name_ref H, file.%H.decl [concrete = constants.%H]
// CHECK:STDOUT:   %H.call: init %empty_tuple.type = call %H.ref()
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- no_else.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT:   %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT:   %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT:   %Bool.type: type = fn_type @Bool [concrete]
// CHECK:STDOUT:   %Bool: %Bool.type = struct_value () [concrete]
// CHECK:STDOUT:   %pattern_type.831: type = pattern_type bool [concrete]
// CHECK:STDOUT:   %If.type: type = fn_type @If [concrete]
// CHECK:STDOUT:   %If: %If.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %If.decl: %If.type = fn_decl @If [concrete = constants.%If] {
// CHECK:STDOUT:     %b.patt: %pattern_type.831 = value_binding_pattern b [concrete]
// CHECK:STDOUT:     %b.param_patt: %pattern_type.831 = value_param_pattern %b.patt, call_param0 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %b.param: bool = value_param call_param0
// CHECK:STDOUT:     %.loc7_10.1: type = splice_block %.loc7_10.3 [concrete = bool] {
// CHECK:STDOUT:       %Bool.call: init type = call constants.%Bool() [concrete = bool]
// CHECK:STDOUT:       %.loc7_10.2: type = value_of_initializer %Bool.call [concrete = bool]
// CHECK:STDOUT:       %.loc7_10.3: type = converted %Bool.call, %.loc7_10.2 [concrete = bool]
// CHECK:STDOUT:     }
// CHECK:STDOUT:     %b: bool = value_binding b, %b.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @If(%b.param: bool) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %b.ref: bool = name_ref b, %b
// CHECK:STDOUT:   if %b.ref br !if.then else br !if.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then:
// CHECK:STDOUT:   %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT:   %F.call: init %empty_tuple.type = call %F.ref()
// CHECK:STDOUT:   br !if.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else:
// CHECK:STDOUT:   %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT:   %G.call: init %empty_tuple.type = call %G.ref()
// CHECK:STDOUT:   return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- unreachable_fallthrough.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT:   %Bool.type: type = fn_type @Bool [concrete]
// CHECK:STDOUT:   %Bool: %Bool.type = struct_value () [concrete]
// CHECK:STDOUT:   %pattern_type.831: type = pattern_type bool [concrete]
// CHECK:STDOUT:   %.df2: form = init_form bool, call_param1 [concrete]
// CHECK:STDOUT:   %If.type: type = fn_type @If [concrete]
// CHECK:STDOUT:   %If: %If.type = struct_value () [concrete]
// CHECK:STDOUT:   %false: bool = bool_literal false [concrete]
// CHECK:STDOUT:   %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT:   %Copy.Op.type: type = fn_type @Copy.Op [concrete]
// CHECK:STDOUT:   %Copy.impl_witness.348: <witness> = impl_witness imports.%Copy.impl_witness_table.3cc [concrete]
// CHECK:STDOUT:   %Copy.facet: %Copy.type = facet_value bool, (%Copy.impl_witness.348) [concrete]
// CHECK:STDOUT:   %.56b: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet [concrete]
// CHECK:STDOUT:   %bool.as.Copy.impl.Op.type: type = fn_type @bool.as.Copy.impl.Op [concrete]
// CHECK:STDOUT:   %bool.as.Copy.impl.Op: %bool.as.Copy.impl.Op.type = struct_value () [concrete]
// CHECK:STDOUT:   %bool.as.Copy.impl.Op.bound.082: <bound method> = bound_method %false, %bool.as.Copy.impl.Op [concrete]
// CHECK:STDOUT:   %true: bool = bool_literal true [concrete]
// CHECK:STDOUT:   %bool.as.Copy.impl.Op.bound.12b: <bound method> = bound_method %true, %bool.as.Copy.impl.Op [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT:   %Core.import_ref.595: %bool.as.Copy.impl.Op.type = import_ref Core//prelude/parts/copy, loc{{\d+_\d+}}, loaded [concrete = constants.%bool.as.Copy.impl.Op]
// CHECK:STDOUT:   %Copy.impl_witness_table.3cc = impl_witness_table (%Core.import_ref.595), @bool.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT:   %If.decl: %If.type = fn_decl @If [concrete = constants.%If] {
// CHECK:STDOUT:     %b.patt: %pattern_type.831 = value_binding_pattern b [concrete]
// CHECK:STDOUT:     %b.param_patt: %pattern_type.831 = value_param_pattern %b.patt, call_param0 [concrete]
// CHECK:STDOUT:     %return.patt: %pattern_type.831 = return_slot_pattern [concrete]
// CHECK:STDOUT:     %return.param_patt: %pattern_type.831 = out_param_pattern %return.patt, call_param1 [concrete]
// CHECK:STDOUT:   } {
// CHECK:STDOUT:     %Bool.call.loc4_19: init type = call constants.%Bool() [concrete = bool]
// CHECK:STDOUT:     %.loc4_19.1: type = value_of_initializer %Bool.call.loc4_19 [concrete = bool]
// CHECK:STDOUT:     %.loc4_19.2: type = converted %Bool.call.loc4_19, %.loc4_19.1 [concrete = bool]
// CHECK:STDOUT:     %.loc4_19.3: form = init_form %.loc4_19.2, call_param1 [concrete = constants.%.df2]
// CHECK:STDOUT:     %b.param: bool = value_param call_param0
// CHECK:STDOUT:     %.loc4_10.1: type = splice_block %.loc4_10.3 [concrete = bool] {
// CHECK:STDOUT:       %Bool.call.loc4_10: init type = call constants.%Bool() [concrete = bool]
// CHECK:STDOUT:       %.loc4_10.2: type = value_of_initializer %Bool.call.loc4_10 [concrete = bool]
// CHECK:STDOUT:       %.loc4_10.3: type = converted %Bool.call.loc4_10, %.loc4_10.2 [concrete = bool]
// CHECK:STDOUT:     }
// CHECK:STDOUT:     %b: bool = value_binding b, %b.param
// CHECK:STDOUT:     %return.param: ref bool = out_param call_param1
// CHECK:STDOUT:     %return: ref bool = return_slot %return.param
// CHECK:STDOUT:   }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @If(%b.param: bool) -> bool {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT:   %b.ref: bool = name_ref b, %b
// CHECK:STDOUT:   if %b.ref br !if.then else br !if.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then:
// CHECK:STDOUT:   %false: bool = bool_literal false [concrete = constants.%false]
// CHECK:STDOUT:   %impl.elem0.loc6: %.56b = impl_witness_access constants.%Copy.impl_witness.348, element0 [concrete = constants.%bool.as.Copy.impl.Op]
// CHECK:STDOUT:   %bound_method.loc6: <bound method> = bound_method %false, %impl.elem0.loc6 [concrete = constants.%bool.as.Copy.impl.Op.bound.082]
// CHECK:STDOUT:   %bool.as.Copy.impl.Op.call.loc6: init bool = call %bound_method.loc6(%false) [concrete = constants.%false]
// CHECK:STDOUT:   return %bool.as.Copy.impl.Op.call.loc6 to %return.param
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else:
// CHECK:STDOUT:   %true: bool = bool_literal true [concrete = constants.%true]
// CHECK:STDOUT:   %impl.elem0.loc8: %.56b = impl_witness_access constants.%Copy.impl_witness.348, element0 [concrete = constants.%bool.as.Copy.impl.Op]
// CHECK:STDOUT:   %bound_method.loc8: <bound method> = bound_method %true, %impl.elem0.loc8 [concrete = constants.%bool.as.Copy.impl.Op.bound.12b]
// CHECK:STDOUT:   %bool.as.Copy.impl.Op.call.loc8: init bool = call %bound_method.loc8(%true) [concrete = constants.%true]
// CHECK:STDOUT:   return %bool.as.Copy.impl.Op.call.loc8 to %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: