Jon Ross-PerkinsandRichard Smith 7ded56ef35 Improve namespace handling in imports. (#4153) ...

This implements a few closely related features:

- Starts merging namespaces discovered inside imports.
- Stores results of cross-package name lookup as an entry inside the
scope.
  - Note this is particularly visible with `i32`.
- Moves more of the imported instructions to the import scope.

Note this is primarily for executing the namespace TODO in check.cpp,
which is removed here.
`testdata/namespace/merging_with_indirections.carbon` tests key
behavior.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>

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..

generic

Improve namespace handling in imports. (#4153)

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no_prelude

Improve namespace handling in imports. (#4153)

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adapt.carbon

Improve namespace handling in imports. (#4153)

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base_field.carbon

Improve namespace handling in imports. (#4153)

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base_function_unqualified.carbon

Improve namespace handling in imports. (#4153)

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base_method_qualified.carbon

Improve namespace handling in imports. (#4153)

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base_method_shadow.carbon

Improve namespace handling in imports. (#4153)

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base_method.carbon

Improve namespace handling in imports. (#4153)

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base.carbon

Improve namespace handling in imports. (#4153)

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basic.carbon

Improve namespace handling in imports. (#4153)

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complete_in_member_fn.carbon

Improve namespace handling in imports. (#4153)

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compound_field.carbon

Improve namespace handling in imports. (#4153)

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cross_package_import.carbon

Improve namespace handling in imports. (#4153)

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derived_to_base.carbon

Improve namespace handling in imports. (#4153)

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extend_adapt.carbon

Improve namespace handling in imports. (#4153)

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extern.carbon

Improve namespace handling in imports. (#4153)

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fail_abstract.carbon

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fail_adapt_bad_decl.carbon

Improve namespace handling in imports. (#4153)

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fail_adapt_bad_type.carbon

Improve namespace handling in imports. (#4153)

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fail_adapt_modifiers.carbon

Improve namespace handling in imports. (#4153)

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fail_adapt_with_subobjects.carbon

Improve namespace handling in imports. (#4153)

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fail_addr_not_self.carbon

Improve namespace handling in imports. (#4153)

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fail_addr_self.carbon

Improve namespace handling in imports. (#4153)

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fail_base_as_declared_name.carbon

Move some of the test information to TIP lines (#4007)

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fail_base_bad_type.carbon

Improve namespace handling in imports. (#4153)

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fail_base_method_define.carbon

Improve namespace handling in imports. (#4153)

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fail_base_misplaced.carbon

Format types in SemIR using the formatting for their instruction. (#4035)

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fail_base_modifiers.carbon

Improve namespace handling in imports. (#4153)

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fail_base_no_extend.carbon

Improve namespace handling in imports. (#4153)

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fail_base_repeated.carbon

Improve namespace handling in imports. (#4153)

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fail_base_unbound.carbon

Improve namespace handling in imports. (#4153)

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fail_compound_type_mismatch.carbon

Improve namespace handling in imports. (#4153)

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fail_convert_to_invalid.carbon

Improve namespace handling in imports. (#4153)

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fail_derived_to_base.carbon

Improve namespace handling in imports. (#4153)

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fail_extend_cycle.carbon

Improve namespace handling in imports. (#4153)

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fail_field_modifiers.carbon

Improve namespace handling in imports. (#4153)

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fail_generic_method.carbon

Improve namespace handling in imports. (#4153)

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fail_import_misuses.carbon

Improve namespace handling in imports. (#4153)

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fail_incomplete.carbon

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fail_init_as_inplace.carbon

Improve namespace handling in imports. (#4153)

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fail_init.carbon

Improve namespace handling in imports. (#4153)

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fail_memaccess_category.carbon

Improve namespace handling in imports. (#4153)

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fail_member_of_let.carbon

Improve namespace handling in imports. (#4153)

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fail_method_modifiers.carbon

Improve namespace handling in imports. (#4153)

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fail_method_redefinition.carbon

Improve namespace handling in imports. (#4153)

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fail_method.carbon

Improve namespace handling in imports. (#4153)

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fail_modifiers.carbon

Improve namespace handling in imports. (#4153)

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fail_out_of_line_decl.carbon

Improve namespace handling in imports. (#4153)

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fail_redeclaration_introducer.carbon

Improve namespace handling in imports. (#4153)

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fail_redeclaration_scope.carbon

Improve namespace handling in imports. (#4153)

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fail_redefinition.carbon

Improve namespace handling in imports. (#4153)

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fail_scope.carbon

Improve namespace handling in imports. (#4153)

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fail_self_type_member.carbon

Format types in SemIR using the formatting for their instruction. (#4035)

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fail_self.carbon

Improve namespace handling in imports. (#4153)

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fail_todo_local_class.carbon

Format types in SemIR using the formatting for their instruction. (#4035)

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fail_todo_modifiers.carbon

Improve namespace handling in imports. (#4153)

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fail_unbound_field.carbon

Improve namespace handling in imports. (#4153)

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fail_unknown_member.carbon

Improve namespace handling in imports. (#4153)

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field_access_in_value.carbon

Improve namespace handling in imports. (#4153)

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field_access.carbon

Improve namespace handling in imports. (#4153)

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forward_declared.carbon

Improve namespace handling in imports. (#4153)

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generic_method.carbon

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generic.carbon

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import_base.carbon

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import_forward_decl.carbon

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import_indirect.carbon

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import_member_cycle.carbon

Improve namespace handling in imports. (#4153)

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import_struct_cyle.carbon

Improve namespace handling in imports. (#4153)

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import.carbon

Improve namespace handling in imports. (#4153)

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init_adapt.carbon

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init_as.carbon

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init_nested.carbon

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init.carbon

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method.carbon

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nested_name.carbon

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nested.carbon

Improve namespace handling in imports. (#4153)

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raw_self_type.carbon

Improve namespace handling in imports. (#4153)

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raw_self.carbon

Improve namespace handling in imports. (#4153)

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redeclaration_introducer.carbon

Improve namespace handling in imports. (#4153)

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redeclaration.carbon

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reenter_scope.carbon

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reorder_qualified.carbon

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reorder.carbon

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scope.carbon

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self_conversion.carbon

Improve namespace handling in imports. (#4153)

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self_type.carbon

Improve namespace handling in imports. (#4153)

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self.carbon

Improve namespace handling in imports. (#4153)

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static_method.carbon

Improve namespace handling in imports. (#4153)

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syntactic_merge_literal.carbon

Improve namespace handling in imports. (#4153)

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