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https://github.com/carbon-language/carbon-lang.git
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Bartłomiej Rosa
505c4ae308
When building an impl witness thunk for a generic associated function, trailing self-specific arguments could still mention outer interface parameters (or `Self`) in their types. That left a SymbolicBinding that did not belong to the thunk's generic, and evaluation aborted instead of succeeding. Substitute the outer specific arguments into those trailing arguments with `SubstConstant` before adjusting bind indices. Fixes #7919.
70 lines
1.5 KiB
Plaintext
70 lines
1.5 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/none.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/impl/generic_method_constraint.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/generic_method_constraint.carbon
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// Regression tests for https://github.com/carbon-language/carbon-lang/issues/7919:
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// building an impl witness thunk must not crash when an associated function's
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// generic parameter constraint depends on an enclosing interface parameter.
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// --- dependent_on_interface_param.carbon
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library "[[@TEST_NAME]]";
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interface A(T: type) {
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fn F(self);
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}
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interface B(T: type) {
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fn G[U: A(T)](u: U);
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}
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class C {}
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impl C as B(()) {
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fn G[U: A(())](unused u: U) {}
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}
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// --- dependent_on_self.carbon
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library "[[@TEST_NAME]]";
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interface A(T: type) {
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fn F(self);
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}
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interface B(T: type) {
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fn G[U: A(Self)](u: U);
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}
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class C {}
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impl C as B(()) {
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fn G[U: A(C)](unused u: U) {}
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}
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// --- independent_constraint_still_ok.carbon
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library "[[@TEST_NAME]]";
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interface A {
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fn F(self);
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}
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interface B(T: type) {
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fn G[U: A](u: U, t: T);
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}
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class C {}
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impl C as B(()) {
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fn G[U: A](unused u: U, unused t: ()) {}
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}
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