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carbon-lang/toolchain/check/testdata/if_expr/fail_partial_constant.carbon
T
Geoff RomerandJon Ross-Perkins dc32aa2690 Initial support for binding patterns in SemIR (#4221) 
Introduces the `BindingPattern` and `SymbolicBindingPattern` insts, and
a separate stack of pattern blocks that they are emitted into. The
intent is to generate the corresponding pattern-matching insts (like
`BindName`) from them in a separate pass, but that is deferred to future
PRs.

See
[here](https://docs.google.com/document/d/1U_vQH17V893J9aF1LJXUnFYBNSs2MjKl4bJPaWCB2zo/edit?usp=sharing&resourcekey=0-w0xGYZ0An31Kpz-wvzSXwQ)
for the design this is based on, but note that during review we have
chosen to deviate from that design by putting the patterns in separate
blocks, and omitting the "forward references" from a `BindingPattern` to
its corresponding `BindName`. This in turn necessitates having separate
inst kinds for symbolic and non-symbolic binding patterns.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2024-09-25 19:12:58 +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
// 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
// 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
// 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: %.1: type = tuple_type () [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: %Int32.type: type = fn_type @Int32 [template]
// CHECK:STDOUT: %Int32: %Int32.type = struct_value () [template]
// CHECK:STDOUT: %.2: i32 = int_literal 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: .Int32 = %import_ref.2
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/operators
// CHECK:STDOUT: import Core//prelude/types
// CHECK:STDOUT: import Core//prelude/operators/arithmetic
// CHECK:STDOUT: import Core//prelude/operators/as
// CHECK:STDOUT: import Core//prelude/operators/bitwise
// CHECK:STDOUT: import Core//prelude/operators/comparison
// CHECK:STDOUT: import Core//prelude/types/bool
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref.1: %Bool.type = import_ref Core//prelude/types/bool, inst+2, loaded [template = constants.%Bool]
// CHECK:STDOUT: %import_ref.2: %Int32.type = import_ref Core//prelude/types, inst+4, loaded [template = constants.%Int32]
// 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: } {
// 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 = param b, runtime_param0
// CHECK:STDOUT: %b: bool = bind_name b, %b.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Bool() -> type = "bool.make_type";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ConditionIsNonConstant(%b: 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.make_type_32.loc12_20: init type = call constants.%Int32() [template = i32]
// CHECK:STDOUT: %.loc12_20.1: type = value_of_initializer %int.make_type_32.loc12_20 [template = i32]
// CHECK:STDOUT: %.loc12_20.2: type = converted %int.make_type_32.loc12_20, %.loc12_20.1 [template = i32]
// CHECK:STDOUT: br !if.expr.result(%.loc12_20.2)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else:
// CHECK:STDOUT: %int.make_type_32.loc12_29: init type = call constants.%Int32() [template = i32]
// CHECK:STDOUT: %.loc12_24.1: type = value_of_initializer %int.make_type_32.loc12_29 [template = i32]
// CHECK:STDOUT: %.loc12_24.2: type = converted %int.make_type_32.loc12_29, %.loc12_24.1 [template = i32]
// CHECK:STDOUT: br !if.expr.result(%.loc12_24.2)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result:
// CHECK:STDOUT: %.loc12_10: 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: %.loc12_35: i32 = int_literal 1 [template = constants.%.2]
// CHECK:STDOUT: assign %v.var, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Int32() -> type = "int.make_type_32";
// 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: %.1: type = tuple_type () [template]
// CHECK:STDOUT: %ChosenBranchIsNonConstant: %ChosenBranchIsNonConstant.type = struct_value () [template]
// CHECK:STDOUT: %.2: bool = bool_literal true [template]
// CHECK:STDOUT: %Int32.type: type = fn_type @Int32 [template]
// CHECK:STDOUT: %Int32: %Int32.type = struct_value () [template]
// CHECK:STDOUT: %.3: i32 = int_literal 1 [template]
// CHECK:STDOUT: %.4: bool = bool_literal false [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: .Int32 = %import_ref
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/operators
// CHECK:STDOUT: import Core//prelude/types
// CHECK:STDOUT: import Core//prelude/operators/arithmetic
// CHECK:STDOUT: import Core//prelude/operators/as
// CHECK:STDOUT: import Core//prelude/operators/bitwise
// CHECK:STDOUT: import Core//prelude/operators/comparison
// CHECK:STDOUT: import Core//prelude/types/bool
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref: %Int32.type = import_ref Core//prelude/types, inst+4, loaded [template = constants.%Int32]
// 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: } {
// CHECK:STDOUT: %t.param: type = param t, runtime_param0
// CHECK:STDOUT: %t: type = bind_name t, %t.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ChosenBranchIsNonConstant(%t: type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %.loc9_13: bool = bool_literal true [template = constants.%.2]
// CHECK:STDOUT: if %.loc9_13 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.make_type_32.loc9: init type = call constants.%Int32() [template = i32]
// CHECK:STDOUT: %.loc9_25.1: type = value_of_initializer %int.make_type_32.loc9 [template = i32]
// CHECK:STDOUT: %.loc9_25.2: type = converted %int.make_type_32.loc9, %.loc9_25.1 [template = i32]
// CHECK:STDOUT: br !if.expr.result.loc9(%.loc9_25.2)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result.loc9:
// CHECK:STDOUT: %.loc9_10: 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: %.loc9_36: i32 = int_literal 1 [template = constants.%.3]
// CHECK:STDOUT: assign %v.var, <error>
// CHECK:STDOUT: %.loc13_13: bool = bool_literal false [template = constants.%.4]
// CHECK:STDOUT: if %.loc13_13 br !if.expr.then.loc13 else br !if.expr.else.loc13
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then.loc13:
// CHECK:STDOUT: %int.make_type_32.loc13: init type = call constants.%Int32() [template = i32]
// CHECK:STDOUT: %.loc13_24.1: type = value_of_initializer %int.make_type_32.loc13 [template = i32]
// CHECK:STDOUT: %.loc13_24.2: type = converted %int.make_type_32.loc13, %.loc13_24.1 [template = i32]
// CHECK:STDOUT: br !if.expr.result.loc13(%.loc13_24.2)
// 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_10: 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: %.loc13_37: i32 = int_literal 1 [template = constants.%.3]
// CHECK:STDOUT: assign %w.var, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Int32() -> type = "int.make_type_32";
// CHECK:STDOUT:
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