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33110d096c
* Rewrite constraints are stored in a facet type, substituted, imported, and formatted. * We now distinguish `.Self` from other symbolic bindings in two ways: * `.Self` itself now has an invalid compile time binding index (since it doesn't bind to any of the generic parameters). As a result, we no longer need to create a generic region in `handle_where.cpp`. * There is a new phase tracking values that are only symbolic because they transitively depend on `.Self`. This allows us to give the result of a `where` expression template phase as long as it doesn't use any symbolic constants other than `.Self` or other designators. * `AddConstant` has been removed from `check/context` since it was only used from `eval`. This meant less plumbing of the phase change. * Evaluation of `BindSymbolicName` now also performs substitution into its type. * Include a bit more information in some diagnostics. * `StringifyTypeExpr` outputs rewrites, which required adding support for associated entities as well. * Associated entities now have an entity name set when importing. * Adds tests for some interesting cases with rewrites and uses of `.Self` mixed with other symbolic constants. Still to do: * There is no validation that any particular type satisfies rewrite constraints. * Access to members of a facet type do not see the rewritten values. * Impls don't recognize whether associated constants have rewrites setting their values. * No support for resolving facet types. --------- Co-authored-by: Josh L <josh11b@users.noreply.github.com> Co-authored-by: Richard Smith <richard@metafoo.co.uk>
68 lines
3.0 KiB
Plaintext
68 lines
3.0 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/fail_impl_bad_assoc_const.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/fail_impl_bad_assoc_const.carbon
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interface I { let T:! type; }
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// CHECK:STDERR: fail_impl_bad_assoc_const.carbon:[[@LINE+3]]:1: error: semantics TODO: `impl of interface with associated constant T` [SemanticsTodo]
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// CHECK:STDERR: impl bool as I {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~
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impl bool as I {}
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// CHECK:STDOUT: --- fail_impl_bad_assoc_const.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %I.type: type = facet_type <@I> [template]
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// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
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// CHECK:STDOUT: %assoc_type: type = assoc_entity_type %I.type, type [template]
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// CHECK:STDOUT: %assoc0: %assoc_type = assoc_entity element0, @I.%T [template]
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// CHECK:STDOUT: %Bool.type: type = fn_type @Bool [template]
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// CHECK:STDOUT: %Bool: %Bool.type = struct_value () [template]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
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// CHECK:STDOUT: .Bool = %import_ref
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// CHECK:STDOUT: import Core//prelude
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// CHECK:STDOUT: import Core//prelude/...
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// CHECK:STDOUT: }
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [template] {
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// CHECK:STDOUT: .Core = imports.%Core
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// CHECK:STDOUT: .I = %I.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %Core.import = import Core
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// CHECK:STDOUT: %I.decl: type = interface_decl @I [template = constants.%I.type] {} {}
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// CHECK:STDOUT: impl_decl @impl [template] {} {
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// CHECK:STDOUT: %bool.make_type: init type = call constants.%Bool() [template = bool]
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// CHECK:STDOUT: %.loc16_6.1: type = value_of_initializer %bool.make_type [template = bool]
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// CHECK:STDOUT: %.loc16_6.2: type = converted %bool.make_type, %.loc16_6.1 [template = bool]
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// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [template = constants.%I.type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: interface @I {
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// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
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// CHECK:STDOUT: %T: type = assoc_const_decl T [template]
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// CHECK:STDOUT: %assoc0: %assoc_type = assoc_entity element0, %T [template = constants.%assoc0]
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .Self = %Self
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// CHECK:STDOUT: .T = %assoc0
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// CHECK:STDOUT: witness = (%T)
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: impl @impl: %.loc16_6.2 as %I.ref {
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: witness = <error>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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