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Implement #4864: Core is a keyword (#4909)

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Change representation of package names from `IdentifierId` to
`PackageNameId`, and add a special value `PackageNameId::Core` for the
Core package. Add a `Core` expression to name the Core package, and
support for parsing the `Core` keyword in `package` and `import`
declarations.

For now, I've made no changes to instruction fingerprinting or name
mangling. This means that fingerprints and mangled names will collide
between names in the `Core` package and names in a `r#Core` package. See
#4908.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Richard Smith
2025-02-11 21:33:57 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 50b3c825e4
commit 8eb4e24cb6
62 changed files with 935 additions and 487 deletions
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toolchain/parse/node_kind.def
+3 -1
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@@ -105,7 +105,9 @@ CARBON_PARSE_NODE_KIND(SelfTypeNameExpr)
CARBON_PARSE_NODE_KIND(BaseName)
CARBON_PARSE_NODE_KIND(PackageExpr)
CARBON_PARSE_NODE_KIND(PackageName)
CARBON_PARSE_NODE_KIND(CoreNameExpr)
CARBON_PARSE_NODE_KIND(IdentifierPackageName)
CARBON_PARSE_NODE_KIND(CorePackageName)
CARBON_PARSE_NODE_KIND(LibraryName)
CARBON_PARSE_NODE_KIND(PackageIntroducer)