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carbon-lang/toolchain/check/testdata/while/while.carbon
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Dana Jansens fcae9610bd Make SemIR::TypeType be an empty FacetType instruction (#7813) 
The type `type` is now a `FacetType` inst with no constraints. This
brings the model implemented in the toolchain into better alignment with
the language design. The `SemIR::TypeType` struct remains as a scope for
holding the `TypeInstId`, `ConstantId`, and `TypeId` constants, but is
not an `InstKind` anymore.

The `TypeType` inst looks a lot like singletons, but there are many
`FacetType` insts so it doesn't quite fit that model. So we put it
alongside singletons with a fixed inst id but refer to it as a more
general "builtin" inst that is not a singleton.
`Namespace::PackageInstId` is similar, and we group it with `TypeType`
conceptually as another builtin instruction with a fixed id.

No conversion is needed anymore to use a `type` as a facet, since types
also have a `FacetType` type. This simplifies and removes a number of
helpers and branches throughout the code.

The `TypeType` inst is now part of the constant store, so we end up
printing it in the constants block in every test. But it's also named
`type` rather than `%type` to preserve the majority of existing
formatting behaviour, though this does look different from other
constants.

Assisted-by: Opus 5 was used to generate a first draft and validate the
refactoring. Though nearly everything non-trivial the tool wrote has
been modified or rewritten.
2026-09-22 15:04:40 +00:00

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// 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/while/while.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/while/while.carbon
// --- while.carbon
library "[[@TEST_NAME]]";
fn Cond() -> bool;
fn F();
fn G();
fn H();
//@dump-sem-ir-begin
fn While() {
F();
while (Cond()) {
G();
}
H();
}
//@dump-sem-ir-end
// --- unreachable_end.carbon
library "[[@TEST_NAME]]";
fn Cond() -> bool;
fn F();
fn G();
fn H();
//@dump-sem-ir-begin
fn While() {
F();
while (Cond()) {
G();
return;
}
H();
}
//@dump-sem-ir-end
// --- break_continue.carbon
library "[[@TEST_NAME]]";
fn A() -> bool;
fn B() -> bool;
fn C() -> bool;
fn D() -> bool;
fn E() -> bool;
fn F() -> bool;
fn G() -> bool;
fn H() -> bool;
//@dump-sem-ir-begin
fn While() {
while (A()) {
if (B()) { continue; }
if (C()) { break; }
while (D()) {
if (E()) { continue; }
if (F()) { break; }
}
if (G()) { continue; }
if (H()) { break; }
}
}
//@dump-sem-ir-end
// --- fail_bad_condition.carbon
library "[[@TEST_NAME]]";
fn While() {
// CHECK:STDERR: fail_bad_condition.carbon:[[@LINE+7]]:9: error: cannot implicitly convert expression of type `{}` to `bool` [ConversionFailure]
// CHECK:STDERR: while ({}) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_bad_condition.carbon:[[@LINE+4]]:9: note: type `{}` does not implement interface `Core.ImplicitAs(bool)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: while ({}) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
while ({}) {}
}
// --- fail_bad_break_continue.carbon
library "[[@TEST_NAME]]";
fn While() {
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `continue` can only be used in a loop [ContinueOutsideLoop]
// CHECK:STDERR: continue;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
continue;
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `break` can only be used in a loop [BreakOutsideLoop]
// CHECK:STDERR: break;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
break;
while (false) {
continue;
break;
}
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `continue` can only be used in a loop [ContinueOutsideLoop]
// CHECK:STDERR: continue;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
continue;
// CHECK:STDERR: fail_bad_break_continue.carbon:[[@LINE+4]]:3: error: `break` can only be used in a loop [BreakOutsideLoop]
// CHECK:STDERR: break;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
break;
}
// CHECK:STDOUT: --- while.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Cond.type: type = fn_type @Cond [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Cond: %Cond.type = struct_value () [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [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: %While.type: type = fn_type @While [concrete]
// CHECK:STDOUT: %While: %While.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %While.decl: %While.type = fn_decl @While [concrete = constants.%While] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @While() {
// CHECK:STDOUT: !entry:
// 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 !while.cond
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond:
// CHECK:STDOUT: %Cond.ref: %Cond.type = name_ref Cond, file.%Cond.decl [concrete = constants.%Cond]
// CHECK:STDOUT: %Cond.call: init bool = call %Cond.ref()
// CHECK:STDOUT: %.loc12_16.1: bool = value_of_initializer %Cond.call
// CHECK:STDOUT: %.loc12_16.2: bool = converted %Cond.call, %.loc12_16.1
// CHECK:STDOUT: if %.loc12_16.2 br !while.body else br !while.done
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body:
// 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 !while.cond
// CHECK:STDOUT:
// CHECK:STDOUT: !while.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: --- unreachable_end.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Cond.type: type = fn_type @Cond [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Cond: %Cond.type = struct_value () [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [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: %While.type: type = fn_type @While [concrete]
// CHECK:STDOUT: %While: %While.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %While.decl: %While.type = fn_decl @While [concrete = constants.%While] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @While() {
// CHECK:STDOUT: !entry:
// 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 !while.cond
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond:
// CHECK:STDOUT: %Cond.ref: %Cond.type = name_ref Cond, file.%Cond.decl [concrete = constants.%Cond]
// CHECK:STDOUT: %Cond.call: init bool = call %Cond.ref()
// CHECK:STDOUT: %.loc12_16.1: bool = value_of_initializer %Cond.call
// CHECK:STDOUT: %.loc12_16.2: bool = converted %Cond.call, %.loc12_16.1
// CHECK:STDOUT: if %.loc12_16.2 br !while.body else br !while.done
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body:
// 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: !while.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: --- break_continue.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %A.type: type = fn_type @A [concrete]
// CHECK:STDOUT: %A: %A.type = struct_value () [concrete]
// CHECK:STDOUT: %B.type: type = fn_type @B [concrete]
// CHECK:STDOUT: %B: %B.type = struct_value () [concrete]
// CHECK:STDOUT: %C.type: type = fn_type @C [concrete]
// CHECK:STDOUT: %C: %C.type = struct_value () [concrete]
// CHECK:STDOUT: %D.type: type = fn_type @D [concrete]
// CHECK:STDOUT: %D: %D.type = struct_value () [concrete]
// CHECK:STDOUT: %E.type: type = fn_type @E [concrete]
// CHECK:STDOUT: %E: %E.type = struct_value () [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [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: %While.type: type = fn_type @While [concrete]
// CHECK:STDOUT: %While: %While.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %While.decl: %While.type = fn_decl @While [concrete = constants.%While] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @While() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond.loc14:
// CHECK:STDOUT: %A.ref: %A.type = name_ref A, file.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %A.call: init bool = call %A.ref()
// CHECK:STDOUT: %.loc14_13.1: bool = value_of_initializer %A.call
// CHECK:STDOUT: %.loc14_13.2: bool = converted %A.call, %.loc14_13.1
// CHECK:STDOUT: if %.loc14_13.2 br !while.body.loc14 else br !while.done.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body.loc14:
// CHECK:STDOUT: %B.ref: %B.type = name_ref B, file.%B.decl [concrete = constants.%B]
// CHECK:STDOUT: %B.call: init bool = call %B.ref()
// CHECK:STDOUT: %.loc15_12.1: bool = value_of_initializer %B.call
// CHECK:STDOUT: %.loc15_12.2: bool = converted %B.call, %.loc15_12.1
// CHECK:STDOUT: if %.loc15_12.2 br !if.then.loc15 else br !if.else.loc15
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc15:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc15:
// CHECK:STDOUT: %C.ref: %C.type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %C.call: init bool = call %C.ref()
// CHECK:STDOUT: %.loc16_12.1: bool = value_of_initializer %C.call
// CHECK:STDOUT: %.loc16_12.2: bool = converted %C.call, %.loc16_12.1
// CHECK:STDOUT: if %.loc16_12.2 br !if.then.loc16 else br !if.else.loc16
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc16:
// CHECK:STDOUT: br !while.done.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc16:
// CHECK:STDOUT: br !while.cond.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !while.cond.loc17:
// CHECK:STDOUT: %D.ref: %D.type = name_ref D, file.%D.decl [concrete = constants.%D]
// CHECK:STDOUT: %D.call: init bool = call %D.ref()
// CHECK:STDOUT: %.loc17_15.1: bool = value_of_initializer %D.call
// CHECK:STDOUT: %.loc17_15.2: bool = converted %D.call, %.loc17_15.1
// CHECK:STDOUT: if %.loc17_15.2 br !while.body.loc17 else br !while.done.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !while.body.loc17:
// CHECK:STDOUT: %E.ref: %E.type = name_ref E, file.%E.decl [concrete = constants.%E]
// CHECK:STDOUT: %E.call: init bool = call %E.ref()
// CHECK:STDOUT: %.loc18_14.1: bool = value_of_initializer %E.call
// CHECK:STDOUT: %.loc18_14.2: bool = converted %E.call, %.loc18_14.1
// CHECK:STDOUT: if %.loc18_14.2 br !if.then.loc18 else br !if.else.loc18
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc18:
// CHECK:STDOUT: br !while.cond.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc18:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %F.call: init bool = call %F.ref()
// CHECK:STDOUT: %.loc19_14.1: bool = value_of_initializer %F.call
// CHECK:STDOUT: %.loc19_14.2: bool = converted %F.call, %.loc19_14.1
// CHECK:STDOUT: if %.loc19_14.2 br !if.then.loc19 else br !if.else.loc19
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc19:
// CHECK:STDOUT: br !while.done.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc19:
// CHECK:STDOUT: br !while.cond.loc17
// CHECK:STDOUT:
// CHECK:STDOUT: !while.done.loc17:
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %G.call: init bool = call %G.ref()
// CHECK:STDOUT: %.loc21_12.1: bool = value_of_initializer %G.call
// CHECK:STDOUT: %.loc21_12.2: bool = converted %G.call, %.loc21_12.1
// CHECK:STDOUT: if %.loc21_12.2 br !if.then.loc21 else br !if.else.loc21
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc21:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc21:
// CHECK:STDOUT: %H.ref: %H.type = name_ref H, file.%H.decl [concrete = constants.%H]
// CHECK:STDOUT: %H.call: init bool = call %H.ref()
// CHECK:STDOUT: %.loc22_12.1: bool = value_of_initializer %H.call
// CHECK:STDOUT: %.loc22_12.2: bool = converted %H.call, %.loc22_12.1
// CHECK:STDOUT: if %.loc22_12.2 br !if.then.loc22 else br !if.else.loc22
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then.loc22:
// CHECK:STDOUT: br !while.done.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else.loc22:
// CHECK:STDOUT: br !while.cond.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !while.done.loc14:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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