Add `import Cpp;` for C++ built-in entities#6331

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bricknerb:proposal-import-cpp

Commits on Nov 6, 2025

Filling out template with PR 6331
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This proposal introduces an `import Cpp;` directive. This directive makes C++ built-in types, such as `long`, available in Carbon through a clear and explicit mechanism.
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Commits on Nov 10, 2025

Point to the "principle of least surprise".
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