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a10c79569ee697bcab5144af4ed06a78b43849d0
carbon-lang/toolchain/check/testdata/if_expr/fail_partial_constant.carbon
T
Richard Smith a10c79569e Model Core.Int as a class type (#4644) 
Instead of treating `Core.Int` as the toolchain's builtin `IntType`,
model it as a class that adapts the builtin type. This aligns us better
with the intended language model, gives an associated library for
`impl`s involving `Core.Int` to live within, and opens the door adding
member functions to `Core.Int` if we decide that is desirable.
Remarkably it also seems to make the formatted SemIR a little smaller,
because a call to a generic class generates less IR than a call to a
function.
2024-12-16 22:19:23 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/if_expr/fail_partial_constant.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if_expr/fail_partial_constant.carbon
// --- fail_non_constant_condition.carbon
package NonConstantCondition;
fn ConditionIsNonConstant(b: bool) {
// We choose to not accept this even if both arms evaluate to the same
// constant value, because it notionally involves evaluating a non-constant
// condition.
// CHECK:STDERR: fail_non_constant_condition.carbon:[[@LINE+4]]:10: error: cannot evaluate type expression [TypeExprEvaluationFailure]
// CHECK:STDERR: var v: if b then i32 else i32 = 1;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var v: if b then i32 else i32 = 1;
}
// --- fail_non_constant_result.carbon
package NonConstantResult;
fn ChosenBranchIsNonConstant(t: type) {
// CHECK:STDERR: fail_non_constant_result.carbon:[[@LINE+4]]:10: error: cannot evaluate type expression [TypeExprEvaluationFailure]
// CHECK:STDERR: var v: if true then t else i32 = 1;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var v: if true then t else i32 = 1;
// CHECK:STDERR: fail_non_constant_result.carbon:[[@LINE+3]]:10: error: cannot evaluate type expression [TypeExprEvaluationFailure]
// CHECK:STDERR: var w: if false then i32 else t = 1;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
var w: if false then i32 else t = 1;
}
// CHECK:STDOUT: --- fail_non_constant_condition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bool.type: type = fn_type @Bool [template]
// CHECK:STDOUT: %Bool: %Bool.type = struct_value () [template]
// CHECK:STDOUT: %ConditionIsNonConstant.type: type = fn_type @ConditionIsNonConstant [template]
// CHECK:STDOUT: %ConditionIsNonConstant: %ConditionIsNonConstant.type = struct_value () [template]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [template]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: .Bool = %import_ref.1
// CHECK:STDOUT: .Int = %import_ref.2
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .ConditionIsNonConstant = %ConditionIsNonConstant.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %ConditionIsNonConstant.decl: %ConditionIsNonConstant.type = fn_decl @ConditionIsNonConstant [template = constants.%ConditionIsNonConstant] {
// CHECK:STDOUT: %b.patt: bool = binding_pattern b
// CHECK:STDOUT: %b.param_patt: bool = value_param_pattern %b.patt, runtime_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bool.make_type: init type = call constants.%Bool() [template = bool]
// CHECK:STDOUT: %.loc4_30.1: type = value_of_initializer %bool.make_type [template = bool]
// CHECK:STDOUT: %.loc4_30.2: type = converted %bool.make_type, %.loc4_30.1 [template = bool]
// CHECK:STDOUT: %b.param: bool = value_param runtime_param0
// CHECK:STDOUT: %b: bool = bind_name b, %b.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ConditionIsNonConstant(%b.param_patt: bool) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %b.ref: bool = name_ref b, %b
// CHECK:STDOUT: if %b.ref br !if.expr.then else br !if.expr.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then:
// CHECK:STDOUT: %int_32.loc12_20: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %i32.loc12_20: type = class_type @Int, @Int(constants.%int_32) [template = constants.%i32]
// CHECK:STDOUT: br !if.expr.result(%i32.loc12_20)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else:
// CHECK:STDOUT: %int_32.loc12_29: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %i32.loc12_29: type = class_type @Int, @Int(constants.%int_32) [template = constants.%i32]
// CHECK:STDOUT: br !if.expr.result(%i32.loc12_29)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result:
// CHECK:STDOUT: %.loc12: type = block_arg !if.expr.result
// CHECK:STDOUT: %v.var: ref <error> = var v
// CHECK:STDOUT: %v: ref <error> = bind_name v, %v.var
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [template = constants.%int_1]
// CHECK:STDOUT: assign %v.var, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_non_constant_result.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %ChosenBranchIsNonConstant.type: type = fn_type @ChosenBranchIsNonConstant [template]
// CHECK:STDOUT: %ChosenBranchIsNonConstant: %ChosenBranchIsNonConstant.type = struct_value () [template]
// CHECK:STDOUT: %true: bool = bool_literal true [template]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [template]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [template]
// CHECK:STDOUT: %false: bool = bool_literal false [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: .Int = %import_ref.1
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .ChosenBranchIsNonConstant = %ChosenBranchIsNonConstant.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %ChosenBranchIsNonConstant.decl: %ChosenBranchIsNonConstant.type = fn_decl @ChosenBranchIsNonConstant [template = constants.%ChosenBranchIsNonConstant] {
// CHECK:STDOUT: %t.patt: type = binding_pattern t
// CHECK:STDOUT: %t.param_patt: type = value_param_pattern %t.patt, runtime_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %t.param: type = value_param runtime_param0
// CHECK:STDOUT: %t: type = bind_name t, %t.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ChosenBranchIsNonConstant(%t.param_patt: type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %true: bool = bool_literal true [template = constants.%true]
// CHECK:STDOUT: if %true br !if.expr.then.loc9 else br !if.expr.else.loc9
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then.loc9:
// CHECK:STDOUT: %t.ref.loc9: type = name_ref t, %t
// CHECK:STDOUT: br !if.expr.result.loc9(%t.ref.loc9)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else.loc9:
// CHECK:STDOUT: %int_32.loc9: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %i32.loc9: type = class_type @Int, @Int(constants.%int_32) [template = constants.%i32]
// CHECK:STDOUT: br !if.expr.result.loc9(%i32.loc9)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result.loc9:
// CHECK:STDOUT: %.loc9: type = block_arg !if.expr.result.loc9
// CHECK:STDOUT: %v.var: ref <error> = var v
// CHECK:STDOUT: %v: ref <error> = bind_name v, %v.var
// CHECK:STDOUT: %int_1.loc9: Core.IntLiteral = int_value 1 [template = constants.%int_1]
// CHECK:STDOUT: assign %v.var, <error>
// CHECK:STDOUT: %false: bool = bool_literal false [template = constants.%false]
// CHECK:STDOUT: if %false br !if.expr.then.loc13 else br !if.expr.else.loc13
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then.loc13:
// CHECK:STDOUT: %int_32.loc13: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %i32.loc13: type = class_type @Int, @Int(constants.%int_32) [template = constants.%i32]
// CHECK:STDOUT: br !if.expr.result.loc13(%i32.loc13)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else.loc13:
// CHECK:STDOUT: %t.ref.loc13: type = name_ref t, %t
// CHECK:STDOUT: br !if.expr.result.loc13(%t.ref.loc13)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result.loc13:
// CHECK:STDOUT: %.loc13: type = block_arg !if.expr.result.loc13
// CHECK:STDOUT: %w.var: ref <error> = var w
// CHECK:STDOUT: %w: ref <error> = bind_name w, %w.var
// CHECK:STDOUT: %int_1.loc13: Core.IntLiteral = int_value 1 [template = constants.%int_1]
// CHECK:STDOUT: assign %w.var, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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