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Basic name poisoning support (#4654)

Browse Source 
https://github.com/carbon-language/carbon-lang/issues/4622
When using an unqualified name, disallow declaring that name in all
scopes that would make it ambiguous in retrospect.
Doesn't include support for poisoning in `impl library` (see new test
for that with TODO).
Implemented by introduce `InstId::PoisonedName` and entries with it to
`NameScope`.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
Co-authored-by: Geoff Romer <gromer@google.com>
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: josh11b <josh11b@users.noreply.github.com>
Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
This commit is contained in:
Boaz Brickner
2024-12-17 21:08:26 +00:00
committed by GitHub
co-authored by Dana Jansens Richard Smith Geoff Romer Jon Ross-Perkins josh11b josh11b Chandler Carruth Carbon Infra Bot
parent 6b3307c520
commit 9c8773da1b
20 changed files with 1006 additions and 100 deletions
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toolchain/check/handle_function.cpp
+5
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@@ -123,6 +123,11 @@ static auto TryMergeRedecl(Context& context, Parse::AnyFunctionDeclId node_id,
return;
}
if (prev_id.is_poisoned()) {
context.DiagnosePoisonedName(function_info.latest_decl_id());
return;
}
auto prev_function_id = SemIR::FunctionId::Invalid;
auto prev_import_ir_id = SemIR::ImportIRId::Invalid;
CARBON_KIND_SWITCH(context.insts().Get(prev_id)) {