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carbon-lang/toolchain/check/testdata/function/generic/resolve_used.carbon
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Richard Smith 265968b396 Make evaluation of symbolic bindings simpler and more uniform (#5215) 
Factor out logic to evaluate `EntityNameId` instead of duplicating it
between `BindSymbolicName` and `SymbolicBindingPattern`. Remove support
in `SymbolicBindingPattern` for evaluating a pattern to the constant
value of the corresponding binding, which doesn't really make any sense
given that patterns don't generally evaluate to the value that they
matched.

This results in the handling for `SymbolicBindingPattern` being simply
the default handling for an always-constant instruction, so remove the
special case for it entirely and change its constant kind to `Always`.
It's not entirely clear that it makes sense for `SymbolicBindingPattern`
to be treated as a constant when other patterns aren't, but we seem to
be relying on this in various places, so leave it as a constant for now.
Changing it to never be constant will be a smaller change now -- it just
requires changing the `constant_kind`.

The IR changes in the tests are fairly widespread, but mechanical, and
there are two kinds of things changing:

- `symbolic_binding_pattern`s in specifics now evaluate to
`symbolic_binding_pattern`s, not to the argument values. This means in a
few cases we end up with additional `symbolic_binding_pattern`
constants.
- We evaluate the type operand of `symbolic_binding_pattern` now, so an
error in the type will now properly be propagated into an error in the
pattern's constant value.
2025-04-01 20:24:00 +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/function/generic/resolve_used.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/generic/resolve_used.carbon
// CHECK:STDERR: {{.*}}/prelude/types/int.carbon:13:9: error: integer type width of 0 is not positive [IntWidthNotPositive]
// CHECK:STDERR: adapt MakeInt(N);
// CHECK:STDERR: ^~~~~~~~~~
// --- fail_todo_call_monomorphization_error.carbon
library "[[@TEST_NAME]]";
fn ErrorIfNIsZero(N:! Core.IntLiteral()) {
// Check that we resolve the definition of a used specific function by
// ensuring we produce an error when doing so. Notionally this error is
// produced as a result of instantiating the `Core.Int` template, although
// that's not how we currently model `Core.Int`.
// CHECK:STDERR: fail_todo_call_monomorphization_error.carbon:[[@LINE+3]]:10: note: in `i0` used here [ResolvingSpecificHere]
// CHECK:STDERR: var v: Core.Int(N);
// CHECK:STDERR: ^~~~~~~~~~~
var v: Core.Int(N);
}
fn CallNegative() {
// CHECK:STDERR: fail_todo_call_monomorphization_error.carbon:[[@LINE+4]]:3: note: in `ErrorIfNIsZero(0)` used here [ResolvingSpecificHere]
// CHECK:STDERR: ErrorIfNIsZero(0);
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
ErrorIfNIsZero(0);
}
// CHECK:STDOUT: --- fail_todo_call_monomorphization_error.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %IntLiteral.type: type = fn_type @IntLiteral [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %IntLiteral: %IntLiteral.type = struct_value () [concrete]
// CHECK:STDOUT: %N: Core.IntLiteral = bind_symbolic_name N, 0 [symbolic]
// CHECK:STDOUT: %N.patt: Core.IntLiteral = symbolic_binding_pattern N, 0 [symbolic]
// CHECK:STDOUT: %ErrorIfNIsZero.type: type = fn_type @ErrorIfNIsZero [concrete]
// CHECK:STDOUT: %ErrorIfNIsZero: %ErrorIfNIsZero.type = struct_value () [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %Int: type = class_type @Int, @Int(%N) [symbolic]
// CHECK:STDOUT: %require_complete.b4f: <witness> = require_complete_type %Int [symbolic]
// CHECK:STDOUT: %CallNegative.type: type = fn_type @CallNegative [concrete]
// CHECK:STDOUT: %CallNegative: %CallNegative.type = struct_value () [concrete]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %ErrorIfNIsZero.specific_fn: <specific function> = specific_function %ErrorIfNIsZero, @ErrorIfNIsZero(%int_0) [concrete]
// CHECK:STDOUT: %i0: type = class_type @Int, @Int(%int_0) [concrete]
// CHECK:STDOUT: %complete_type.d94: <witness> = complete_type_witness <error> [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .IntLiteral = %Core.IntLiteral
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.IntLiteral: %IntLiteral.type = import_ref Core//prelude/types/int_literal, IntLiteral, loaded [concrete = constants.%IntLiteral]
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .ErrorIfNIsZero = %ErrorIfNIsZero.decl
// CHECK:STDOUT: .CallNegative = %CallNegative.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %ErrorIfNIsZero.decl: %ErrorIfNIsZero.type = fn_decl @ErrorIfNIsZero [concrete = constants.%ErrorIfNIsZero] {
// CHECK:STDOUT: %N.patt.loc4_19.1: Core.IntLiteral = symbolic_binding_pattern N, 0 [symbolic = %N.patt.loc4_19.2 (constants.%N.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc4_39.1: type = splice_block %.loc4_39.3 [concrete = Core.IntLiteral] {
// CHECK:STDOUT: %Core.ref.loc4: <namespace> = name_ref Core, imports.%Core [concrete = imports.%Core]
// CHECK:STDOUT: %IntLiteral.ref: %IntLiteral.type = name_ref IntLiteral, imports.%Core.IntLiteral [concrete = constants.%IntLiteral]
// CHECK:STDOUT: %int_literal.make_type: init type = call %IntLiteral.ref() [concrete = Core.IntLiteral]
// CHECK:STDOUT: %.loc4_39.2: type = value_of_initializer %int_literal.make_type [concrete = Core.IntLiteral]
// CHECK:STDOUT: %.loc4_39.3: type = converted %int_literal.make_type, %.loc4_39.2 [concrete = Core.IntLiteral]
// CHECK:STDOUT: }
// CHECK:STDOUT: %N.loc4_19.1: Core.IntLiteral = bind_symbolic_name N, 0 [symbolic = %N.loc4_19.2 (constants.%N)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %CallNegative.decl: %CallNegative.type = fn_decl @CallNegative [concrete = constants.%CallNegative] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @ErrorIfNIsZero(%N.loc4_19.1: Core.IntLiteral) {
// CHECK:STDOUT: %N.loc4_19.2: Core.IntLiteral = bind_symbolic_name N, 0 [symbolic = %N.loc4_19.2 (constants.%N)]
// CHECK:STDOUT: %N.patt.loc4_19.2: Core.IntLiteral = symbolic_binding_pattern N, 0 [symbolic = %N.patt.loc4_19.2 (constants.%N.patt)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Int.loc12_20.2: type = class_type @Int, @Int(%N.loc4_19.2) [symbolic = %Int.loc12_20.2 (constants.%Int)]
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type @ErrorIfNIsZero.%Int.loc12_20.2 (%Int) [symbolic = %require_complete (constants.%require_complete.b4f)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%N.patt.loc4_19.1: Core.IntLiteral) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %v.patt: @ErrorIfNIsZero.%Int.loc12_20.2 (%Int) = binding_pattern v
// CHECK:STDOUT: %.loc12_3: @ErrorIfNIsZero.%Int.loc12_20.2 (%Int) = var_pattern %v.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref @ErrorIfNIsZero.%Int.loc12_20.2 (%Int) = var v
// CHECK:STDOUT: %.loc12_20: type = splice_block %Int.loc12_20.1 [symbolic = %Int.loc12_20.2 (constants.%Int)] {
// CHECK:STDOUT: %Core.ref.loc12: <namespace> = name_ref Core, imports.%Core [concrete = imports.%Core]
// CHECK:STDOUT: %Int.ref: %Int.type = name_ref Int, imports.%Core.Int [concrete = constants.%Int.generic]
// CHECK:STDOUT: %N.ref: Core.IntLiteral = name_ref N, %N.loc4_19.1 [symbolic = %N.loc4_19.2 (constants.%N)]
// CHECK:STDOUT: %Int.loc12_20.1: type = class_type @Int, @Int(constants.%N) [symbolic = %Int.loc12_20.2 (constants.%Int)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v: ref @ErrorIfNIsZero.%Int.loc12_20.2 (%Int) = bind_name v, %v.var
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CallNegative() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %ErrorIfNIsZero.ref: %ErrorIfNIsZero.type = name_ref ErrorIfNIsZero, file.%ErrorIfNIsZero.decl [concrete = constants.%ErrorIfNIsZero]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0]
// CHECK:STDOUT: %ErrorIfNIsZero.specific_fn: <specific function> = specific_function %ErrorIfNIsZero.ref, @ErrorIfNIsZero(constants.%int_0) [concrete = constants.%ErrorIfNIsZero.specific_fn]
// CHECK:STDOUT: %ErrorIfNIsZero.call: init %empty_tuple.type = call %ErrorIfNIsZero.specific_fn()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ErrorIfNIsZero(constants.%N) {
// CHECK:STDOUT: %N.loc4_19.2 => constants.%N
// CHECK:STDOUT: %N.patt.loc4_19.2 => constants.%N.patt
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ErrorIfNIsZero(constants.%int_0) {
// CHECK:STDOUT: %N.loc4_19.2 => constants.%int_0
// CHECK:STDOUT: %N.patt.loc4_19.2 => constants.%N.patt
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Int.loc12_20.2 => constants.%i0
// CHECK:STDOUT: %require_complete => constants.%complete_type.d94
// CHECK:STDOUT: }
// CHECK:STDOUT:
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