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37 lines
978 B
Plaintext
37 lines
978 B
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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package ExplorerTest api;
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interface Iface {
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let T:! type;
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}
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fn F[T:! Iface where .T == i32](x: T) {}
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class Class {
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extend impl as Iface where .T = i32 {}
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}
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// OK, constraint on `F` rewritten to `T:! Iface where U == i32`, which we can
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// prove from the constraint on `U`.
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fn G[U:! type where .Self == i32, T:! Iface where .T = U](x: T, y: U) {
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F(x);
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}
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// Not OK: would require looking through two levels of `==`.
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fn H[V:! type where .Self == i32, W:! Iface where .T == V](x: W, y: V) {
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// CHECK:STDERR: COMPILATION ERROR: fail_equal_indirectly.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.T) (with value (W).(Iface.T)) == i32, which is not known to be true
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F(x);
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}
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fn Main() -> i32 {
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var x: Class = {};
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G(x, 0);
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H(x, 0);
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return 0;
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}
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