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## Summary - Add a new `Type::SliceLiteral` variant - Infer `SliceLiteral` types for slice expressions, such as `<int-literal>:<int-literal>:<int-literal>`. - Infer "sliced" literal types for subscript expressions using slices, such as `<string-literal>[<slice-literal>]`. - Infer types for expressions involving slices of tuples: `<tuple>[<slice-literal>]`. closes #13853 ## Test Plan - Unit tests for indexing/slicing utility functions - Markdown-based tests for - Subscript expressions `tuple[slice]` - Subscript expressions `string_literal[slice]` - Subscript expressions `bytes_literal[slice]`