mirror of
https://github.com/carbon-language/carbon-lang.git
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Dana JansensandJon Ross-Perkins
4b0e2b03b6
We add a virtual node (`CompileTimeBindingPatternStart`) as the first child of `CompileTimeBindingPattern` which holds the identifier underneath it, so that it is checked just before the type expression of the `CompileTimeBindingPattern`. When we reach this virtual node during check, we add `.Self` as a name in the current scope, and when we reach `CompileTimeBindingPattern` we remove it from scope, which ensures it's present during only the checking of the type expression for the compile time pattern. At the moment the `.Self` has a different type (it's a `TypeType`) than other `.Self` in the facet type (which are a single `FacetType`), but the intention is to immediately substitute it out of the facet type entirely, replacing it with a reference to the compile time binding (a `BindSymbolicName`) itself. A TODO has been added for this. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
133 lines
5.3 KiB
Plaintext
133 lines
5.3 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/facet_types.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/validate_impl_constraints.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/validate_impl_constraints.carbon
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// --- self_impls_modifies_assoc_constant.carbon
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library "[[@TEST_NAME]]";
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interface I { let X:! type; }
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fn F(T:! I where .X = ()) {}
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fn G(T:! I where .Self impls (I where .X = ())) {
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F(T);
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}
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// --- fail_self_impls_modifies_assoc_constant_type_differs.carbon
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library "[[@TEST_NAME]]";
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interface I { let X:! type; }
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fn F(T:! I where .X = ()) {}
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fn G(T:! I where .Self impls (I where .X = {})) {
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// CHECK:STDERR: fail_self_impls_modifies_assoc_constant_type_differs.carbon:[[@LINE+7]]:3: error: cannot convert type `T` that implements `I where .(I.X) = {}` into type implementing `I where .(I.X) = ()` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: F(T);
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// CHECK:STDERR: ^~~~
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// CHECK:STDERR: fail_self_impls_modifies_assoc_constant_type_differs.carbon:[[@LINE-6]]:6: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: fn F(T:! I where .X = ()) {}
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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F(T);
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}
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// --- fail_todo_where_impls_tests_associated_constant_of_generic_type.carbon
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library "[[@TEST_NAME]]";
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class C(U:! type) {}
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// C(U) impls M if U impls L.
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interface L {}
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interface M { let M0:! type; }
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impl forall [U:! L] C(U) as M where .M0 = {} {}
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// U requires that C(.Self) impls M.
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// - C(.Self) impls M can be rewritten as C(U) impls M.
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// - C(U) impls M if U impls L => Requires U impls L.
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fn F(U:! type where C(.Self) impls (M where .M0 = {})) {}
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fn G(T:! L) {
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// CHECK:STDERR: fail_todo_where_impls_tests_associated_constant_of_generic_type.carbon:[[@LINE+7]]:3: error: cannot convert type `T` that implements `L` into type implementing `type where...` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: F(T);
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// CHECK:STDERR: ^~~~
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// CHECK:STDERR: fail_todo_where_impls_tests_associated_constant_of_generic_type.carbon:[[@LINE-6]]:6: note: initializing generic parameter `U` declared here [InitializingGenericParam]
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// CHECK:STDERR: fn F(U:! type where C(.Self) impls (M where .M0 = {})) {}
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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F(T);
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}
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// --- fail_where_impls_tests_associated_constant_of_generic_type_type_differs.carbon
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library "[[@TEST_NAME]]";
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class C(U:! type) {}
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// C(U) impls M if U impls L.
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interface L {}
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interface M { let M0:! type; }
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impl forall [U:! L] C(U) as M where .M0 = () {}
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// U requires that C(.Self) impls M.
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// - C(.Self) impls M can be rewritten as C(U) impls M.
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// - C(U) impls M if U impls L => Requires U impls L.
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fn F(U:! type where C(.Self) impls (M where .M0 = {})) {}
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fn G(T:! L) {
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// CHECK:STDERR: fail_where_impls_tests_associated_constant_of_generic_type_type_differs.carbon:[[@LINE+7]]:3: error: cannot convert type `T` that implements `L` into type implementing `type where...` [ConversionFailureFacetToFacet]
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// CHECK:STDERR: F(T);
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// CHECK:STDERR: ^~~~
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// CHECK:STDERR: fail_where_impls_tests_associated_constant_of_generic_type_type_differs.carbon:[[@LINE-6]]:6: note: initializing generic parameter `U` declared here [InitializingGenericParam]
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// CHECK:STDERR: fn F(U:! type where C(.Self) impls (M where .M0 = {})) {}
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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F(T);
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}
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// --- self_in_interface_generic_param_unconstrained.carbon
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library "[[@TEST_NAME]]";
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interface Z {}
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interface I(T:! type) {}
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fn F(T:! I(.Self) where .Self impls Z) {}
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fn G(T:! Z & I(.Self)) {
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F(T);
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}
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// --- fail_todo_self_in_interface_generic_param_constrained.carbon
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library "[[@TEST_NAME]]";
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interface Z {}
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interface I(T:! Z) {}
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// Implied constraint: .Self impls Z, which is satisfied and checked at the end
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// of the fn signature.
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// CHECK:STDERR: fail_todo_self_in_interface_generic_param_constrained.carbon:[[@LINE+7]]:10: error: cannot convert type `.Self` into type implementing `Z` [ConversionFailureTypeToFacet]
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// CHECK:STDERR: fn F(T:! I(.Self) where .Self impls Z) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_self_in_interface_generic_param_constrained.carbon:[[@LINE-7]]:13: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: interface I(T:! Z) {}
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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fn F(T:! I(.Self) where .Self impls Z) {}
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// CHECK:STDERR: fail_todo_self_in_interface_generic_param_constrained.carbon:[[@LINE+7]]:14: error: cannot convert type `.Self` into type implementing `Z` [ConversionFailureTypeToFacet]
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// CHECK:STDERR: fn G(T:! Z & I(.Self)) {
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: fail_todo_self_in_interface_generic_param_constrained.carbon:[[@LINE-16]]:13: note: initializing generic parameter `T` declared here [InitializingGenericParam]
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// CHECK:STDERR: interface I(T:! Z) {}
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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fn G(T:! Z & I(.Self)) {
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F(T);
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}
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