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Richard SmithandDana Jansens
643ab57f5a
Split up the CppRange interface into smaller parts, with the intent of improving the diagnostic quality and making the implementation easier to understand. This also makes the implementation details of the CppRange machinery private, which breaks one of the existing tests; that test is split into two files, one which tests the low-level machinery works, and another that tests the resulting prelude behavior. This change exposes a crash in `where` expression handling, where we would perform a substitution that creates a new `SpecificConstant` that refers into a region of a generic that has never been resolved. Fix that by resolving the definition region of a generic if eval sees a `SpecificConstant` that refers into it. This is usually not necessary because something else should have resolved that region first, but that doesn't happen here. --------- Co-authored-by: Dana Jansens <danakj@orodu.net>
31 lines
1.2 KiB
Plaintext
31 lines
1.2 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/int.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/where_expr/subst.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/where_expr/subst.carbon
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// --- subst_into_named_constraint.carbon
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library "[[@TEST_NAME]]";
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interface A { let T: type; }
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constraint B {
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require impls A;
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alias U = Self.(A.T);
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}
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// When type-checking this, we will thaw the `.Self` in the `.U = ()`
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// constraint. That performs a substitution of a SpecificConstant that refers
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// into the definition region of constraint B's NamedConstraintWithSelf generic.
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// For this to work, we need to resolve the definition region of that specific
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// as part of the substitution process.
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fn F(generic _: B where .U = ()) {}
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class C { impl as A where .T = () {} }
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fn Test() { F(C); }
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