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Jon Ross-Perkins 8567e02aa7 Refactor handling of cross-package imports. (#3783 )

This revamps the support for cross-package imports, making them look
more like a namespace. The planned model is mentioned on
[#toolchain](https://discord.com/channels/655572317891461132/655578254970716160/1217586076022210670).
This does not implement name lookup into the new namespace structure.

A few key changes in this PR (it's a little sprawling) are:

- Moves logic for adding package imports from context.* to import.*
- Remove SemIR::Import, which was the prior model. This is instead now a
SemIR::Namespace with the NameScope getting a new import_ir_scopes
field.
- Allow SemIR::Namespace to use Parse::ImportDirectiveId in addition to
the prior Parse::NamespaceId
- The import_ir_scopes field includes a NameScopeId so that as we
traverse to child namespaces, we can directly perform name lookup in the
other IR.
- is_closed_import now tracks whether a namespace comes from a different
package. This has a diagnostic implemented in decl_name_stack.

2024-03-14 22:03:30 +00:00

base

Remove legacy repo_name settings (#3772 )

2024-03-13 22:58:56 +00:00

check

Refactor handling of cross-package imports. (#3783 )

2024-03-14 22:03:30 +00:00

codegen

Rename factory functions from 'Create' to 'Make' (#3706 )

2024-02-14 18:26:56 +00:00

diagnostics

Refactor handling of cross-package imports. (#3783 )