mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 22:02:55 +01:00
Chandler Carruth
8be274cf60
Implement the toolchain side of proposal #7254, removing the `:!` binding syntax for generic and template parameters in favor of the keywords `generic`, `template`, and `runtime` plus contextual defaults for phase. For valid programs this is semantics-preserving: each binding resolves to the same phase, and produces the same SemIR, as it did under `:!`/`:`. The parser derives a binding's phase from its syntactic context plus any explicit phase keyword; new diagnostics and error recovery for misused keywords are described below. Implementation details for each component: - Lexer: remove the `:!` (`ColonExclaim`) token, move its virtual parse-node budget onto `:`, and add the `generic` and `runtime` keywords. - Parser: thread a `BindingContext` (`ExplicitParam`, `DeducedParam`, or `CompileTimeEntityParam`) from declaration introducers down through parameter lists to each binding pattern, using a one-token lookahead to distinguish a name-qualifier parameter list from a declaration's own final list. Parameters of a compile-time entity (`class`, `interface`, `constraint`, `choice`, `alias`, `export`, `namespace`) and deduced `[]` parameters default to checked generic; explicit function parameters and local bindings default to runtime. `HandleBindingPattern` resolves the phase from that context plus the keyword: a `generic` keyword needs no node of its own (the phase is carried by the binding's node kind), while a `runtime` keyword is preserved as a `RuntimeBindingName` node so `check` can name it in a diagnostic. A phase keyword that is merely redundant with the contextual default is diagnosed here, without invalidating the parse tree. - Check: a phase keyword that is invalid for its context (for example `runtime` on a checked-generic parameter) is diagnosed here, and recovers by building an error binding that still introduces the name so that later uses of it do not produce cascading errors. The removed `:!` syntax is now rejected as an ordinary parse error. The `form`/`:?`/`->?` ("extended types") portion of proposal #7254 is left for a separate change. Assisted-by: Claude Code
499 lines
18 KiB
Plaintext
499 lines
18 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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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
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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/facet/early_rewrites.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/facet/early_rewrites.carbon
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// Tests where `ImplWitnessAccess` on the RHS of a rewrite constraint is used in
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// other constraints within the same facet type in ways that require the RHS to
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// be evaluated to a concrete value before the facet type is resolved (such as
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// by passing it as a parameter to a generic class). This can be done either by
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// eagerly reading rewrite constraints from the same facet type, or by relying
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// on implied constraints which are checked later.
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// --- fail_todo_implied_constraint_on_self.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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class C(T: Z where .Z1 = ()) {}
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interface J {
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// Implied: .Z1 == ()
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// CHECK:STDERR: fail_todo_implied_constraint_on_self.carbon:[[@LINE+7]]:25: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: let J1: Z where .Z2 = C(.Self);
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_implied_constraint_on_self.carbon:[[@LINE-7]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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let J1: Z where .Z2 = C(.Self);
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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// CHECK:STDERR: fail_todo_implied_constraint_on_self.carbon:[[@LINE+7]]:38: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_implied_constraint_on_self.carbon:[[@LINE-21]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- fail_todo_implied_constraint_on_associated_constant.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(T: Tuple) {}
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interface J {
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// Implied: .Z1 impls Tuple
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// CHECK:STDERR: fail_todo_implied_constraint_on_associated_constant.carbon:[[@LINE+7]]:25: error: cannot convert type `.(Z.Z1)` into type implementing `Tuple` [ConversionFailureTypeToFacet]
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// CHECK:STDERR: let J1: Z where .Z2 = C(.Z1);
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// CHECK:STDERR: ^~~~~~
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// CHECK:STDERR: fail_todo_implied_constraint_on_associated_constant.carbon:[[@LINE-7]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Tuple) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR:
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let J1: Z where .Z2 = C(.Z1);
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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impl D as Z where .Z1 = () and .Z2 = C(()) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- fail_todo_nested_constraint_visible_in_type_parameter.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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class C(T: Z where .Z1 = ()) {}
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interface J {
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// Implied: .Z1 == (), but this is also explicitly required for J1.
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// CHECK:STDERR: fail_todo_nested_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:42: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: let J1: (Z where .Z1 = ()) where .Z2 = C(.Self);
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_nested_constraint_visible_in_type_parameter.carbon:[[@LINE-7]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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let J1: (Z where .Z1 = ()) where .Z2 = C(.Self);
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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// CHECK:STDERR: fail_todo_nested_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:38: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_nested_constraint_visible_in_type_parameter.carbon:[[@LINE-21]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- fail_todo_outer_nested_constraint_visible_in_type_parameter.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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class C(T: Z where .Z1 = ()) {}
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interface J {
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// Implied: .Z1 == (), but this is also explicitly required for J1.
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// CHECK:STDERR: fail_todo_outer_nested_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:26: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: let J1: (Z where .Z2 = C(.Self)) where .Z1 = ();
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_outer_nested_constraint_visible_in_type_parameter.carbon:[[@LINE-7]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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let J1: (Z where .Z2 = C(.Self)) where .Z1 = ();
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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// CHECK:STDERR: fail_todo_outer_nested_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:38: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_outer_nested_constraint_visible_in_type_parameter.carbon:[[@LINE-21]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- fail_todo_earlier_constraint_visible_in_type_parameter.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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class C(T: Z where .Z1 = ()) {}
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interface J {
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// Implied: .Z1 == (), but this is also explicitly required for J1.
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// CHECK:STDERR: fail_todo_earlier_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:38: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: let J1: Z where .Z1 = () and .Z2 = C(.Self);
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_earlier_constraint_visible_in_type_parameter.carbon:[[@LINE-7]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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let J1: Z where .Z1 = () and .Z2 = C(.Self);
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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// CHECK:STDERR: fail_todo_earlier_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:38: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_earlier_constraint_visible_in_type_parameter.carbon:[[@LINE-21]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- fail_todo_later_constraint_visible_in_type_parameter.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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class C(T: Z where .Z1 = ()) {}
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interface J {
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// Implied: .Z1 == (), but this is also explicitly required for J1.
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// CHECK:STDERR: fail_todo_later_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:25: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: let J1: Z where .Z2 = C(.Self) and .Z1 = ();
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_later_constraint_visible_in_type_parameter.carbon:[[@LINE-7]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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let J1: Z where .Z2 = C(.Self) and .Z1 = ();
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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// CHECK:STDERR: fail_todo_later_constraint_visible_in_type_parameter.carbon:[[@LINE+7]]:38: error: cannot convert type `.Self` that implements `Z` into type implementing `Z where .(Z.Z1) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_later_constraint_visible_in_type_parameter.carbon:[[@LINE-21]]:9: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(T: Z where .Z1 = ()) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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impl D as Z where .Z1 = () and .Z2 = C(.Self) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- early_rewrite_applied.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(T: Tuple) {}
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interface J {
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// Implied: .Z1 == (), but this is also explicitly required for J1.
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let J1: Z where .Z1 = () and .Z2 = C(.Z1);
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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impl D as Z where .Z1 = () and .Z2 = C(()) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- early_rewrite_applied_from_nested_self.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(T: Tuple) {}
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interface J {
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// Implied: .Z1 == (), but this is also explicitly required for J1.
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let J1: (Z where .Z1 = ()) where .Z2 = C(.Z1);
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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impl D as Z where .Z1 = () and .Z2 = C(()) {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- early_rewrite_applied_extra_indirection.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Y {
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let Y1: Z;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(T: Tuple) {}
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interface J {
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// .Z2 depends on an two nested accesses of rewrite constraints.
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let J1: Y & Z where .Y1 = .Self and .Z1 = () and .Z2 = C(.Y1.Z1);
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}
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fn F(unused generic T: J) {}
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class D;
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impl D as Z where .Z1 = () and .Z2 = C(()) {}
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impl D as Y where .Y1 = D {}
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- early_rewrite_of_compound_access.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Y {}
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class NeedY(T: Y) {}
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impl () as Y {}
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// These are written differently but should behave the same.
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// Designator access of `.Z1`.
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fn F(generic _: Z where .Z1 = () and .Z2 = NeedY(.Z1)) {}
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// Compound member access of `.Z1`.
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fn G(generic _: Z where .Z1 = () and .Z2 = NeedY(.Self.(Z.Z1))) {}
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// --- fail_todo_resolved_constraint_visible_in_type_parameter.carbon
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library "[[@TEST_NAME]]";
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interface Y {
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let Y1: type;
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}
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interface Z {
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let Z1: Y;
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let Z2: type;
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let Z3: type;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(T: Tuple) {}
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interface J {
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// Implied: .Y1 impls Tuple, but this is also explicitly required for J1.
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let J1: Z & Y where .Y1 = () and .Z1 = .Self and .Z2 = .Z1.Y1 and .Z3 = C(.Z2);
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}
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fn F(unused generic T: J) {}
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class D;
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// Satisfies the implied constraint in J.J1.
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impl D as Y where .Y1 = () {}
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// CHECK:STDERR: fail_todo_resolved_constraint_visible_in_type_parameter.carbon:[[@LINE+4]]:25: error: cannot convert type `.Self` that implements `Z` into type implementing `Y` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: impl D as Z where .Z1 = .Self and .Z2 = () and .Z3 = C(()) {}
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// CHECK:STDERR: ^~~~~
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// CHECK:STDERR:
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impl D as Z where .Z1 = .Self and .Z2 = () and .Z3 = C(()) {}
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// CHECK:STDERR: fail_todo_resolved_constraint_visible_in_type_parameter.carbon:[[@LINE+4]]:31: error: cannot convert type `D` into type implementing `Y & Z where .(Y.Y1) = () and .(Z.Z1) = .Self as Y and .(Z.Z2) = () and .(Z.Z3) = C(() as Tuple)` [ConversionFailureTypeToFacet]
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// CHECK:STDERR: fn G(generic T: J where .J1 = D) {
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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fn G(generic T: J where .J1 = D) {
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F(T);
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}
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// --- fail_todo_early_rewrite_from_previous_impls_constraint.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Y {
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let Y1: type;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(U: Tuple);
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constraint NY(V: type) {
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extend require impls Y where .Y1 = V;
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}
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// CHECK:STDERR: fail_todo_early_rewrite_from_previous_impls_constraint.carbon:[[@LINE+7]]:59: error: cannot convert type `.(Z.Z1).(Y.Y1)` into type implementing `Tuple` [ConversionFailureTypeToFacet]
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// CHECK:STDERR: fn F(unused generic T: Z where .Z1 impls NY(()) and .Z2 = C(.Z1.(Y.Y1))) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~
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// CHECK:STDERR: fail_todo_early_rewrite_from_previous_impls_constraint.carbon:[[@LINE-9]]:9: note: initializing generic parameter `U` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(U: Tuple);
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR:
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fn F(unused generic T: Z where .Z1 impls NY(()) and .Z2 = C(.Z1.(Y.Y1))) {}
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// --- fail_early_rewrite_correct_interface_wrong_self_access_rewrite_in_period_self.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Y {
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let Y1: type;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(U: Tuple);
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constraint NY(V: type) {
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extend require impls Y where .Y1 = V;
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}
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// This should fail: `T.(Y.Y1)` is rewritten to be `()` but `T.(Z.Z1).(Y.Y1)`
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// is used in the argument to `C`.
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//
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// CHECK:STDERR: fail_early_rewrite_correct_interface_wrong_self_access_rewrite_in_period_self.carbon:[[@LINE+7]]:77: error: cannot convert type `.(Z.Z1).(Y.Y1)` into type implementing `Tuple` [ConversionFailureTypeToFacet]
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// CHECK:STDERR: fn F(unused generic T: Z where .Self impls NY(()) and .Z1 impls Y and .Z2 = C(.Z1.(Y.Y1))) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~
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// CHECK:STDERR: fail_early_rewrite_correct_interface_wrong_self_access_rewrite_in_period_self.carbon:[[@LINE-12]]:9: note: initializing generic parameter `U` declared here [InitializingGenericParam]
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// CHECK:STDERR: class C(U: Tuple);
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR:
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fn F(unused generic T: Z where .Self impls NY(()) and .Z1 impls Y and .Z2 = C(.Z1.(Y.Y1))) {}
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// --- fail_early_rewrite_correct_interface_wrong_self_access_rewrite_in_associated_constant.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let Z1: type;
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let Z2: type;
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}
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interface Y {
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let Y1: type;
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}
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interface Tuple {}
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impl () as Tuple {}
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class C(U: Tuple);
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constraint NY(V: type) {
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extend require impls Y where .Y1 = V;
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}
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// This should fail: `T.(Z.Z1).(Y.Y1)` is rewritten to be `()` but `T.(Y.Y1)` is used
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// in the argument to `C`.
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//
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// CHECK:STDERR: fail_early_rewrite_correct_interface_wrong_self_access_rewrite_in_associated_constant.carbon:[[@LINE+4]]:79: error: name `Self` not found [NameNotFound]
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// CHECK:STDERR: fn G(unused generic T: Z where .Z1 impls NY(()) and .Self impls Y and .Z2 = C(Self.(Y.Y1))) {}
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// CHECK:STDERR: ^~~~
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// CHECK:STDERR:
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fn G(unused generic T: Z where .Z1 impls NY(()) and .Self impls Y and .Z2 = C(Self.(Y.Y1))) {}
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// --- fail_nested_facet_type_in_rewrite_does_not_use_rewrite_from_outside.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let X: type;
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let Y: type;
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}
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constraint NZ(PeriodY: type) {
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extend require impls Z where .X = PeriodY;
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}
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fn F(generic T: Z where .Y = {} and .X = NZ(.Y), generic U: T.X) -> U.(Z.X) {
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// This should fail: `U: T.X` contains a rewrite `.X = .Y` in its type, but
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// the value of `U.(Z.Y)` is not known. Only `T.(Z.Y)` is rewritten to `{}`.
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//
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// CHECK:STDERR: fail_nested_facet_type_in_rewrite_does_not_use_rewrite_from_outside.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `{}` to `U.(Z.X)` [ConversionFailure]
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// CHECK:STDERR: return {};
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// CHECK:STDERR: ^~~~~~~~~~
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// CHECK:STDERR: fail_nested_facet_type_in_rewrite_does_not_use_rewrite_from_outside.carbon:[[@LINE+4]]:3: note: type `{}` does not implement interface `Core.ImplicitAs(U.(Z.X))` [MissingImplInMemberAccessInContext]
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// CHECK:STDERR: return {};
|
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// CHECK:STDERR: ^~~~~~~~~~
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|
// CHECK:STDERR:
|
|
return {};
|
|
}
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