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https://github.com/carbon-language/carbon-lang.git
synced 2026-10-01 22:02:45 +01:00
Richard Smith
e0c90767be
The strategy that we use for now to support template instantiation is to check the impl declaration as if it were a generic, but to defer all checking of the impl definition until we see a use in which all template parameters have arguments. At that point, we clone the impl definition and type-check the whole thing, with constant values set on the template parameters corresponding to the given arguments. No caching of template instantiations is performed yet; each time we form a reference to a template instantiation, we instantiate it afresh. We also don't implement the name lookup rule from #949 yet; lookups during template instantiation look only in the actual type and not in the constraint. Depends on #2699
23 lines
648 B
Plaintext
23 lines
648 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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// RUN: %{not} %{explorer-run}
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// RUN: %{not} %{explorer-run-trace}
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package ExplorerTest api;
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interface GetX {
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fn DoIt[self: Self]() -> i32;
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}
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impl forall [template T:! type] T as GetX {
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// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/template/fail_no_member.carbon:[[@LINE+1]]: member access, unexpected i32 in self.x
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fn DoIt[self: Self]() -> i32 { return self.x; }
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}
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fn Main() -> i32 {
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return 0.(GetX.DoIt)();
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}
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