Structures: defstru.ss

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## Structures: `defstru.ss`

Files: `defstru.ss`

This library provides `define-structure` and `define-const-structure` consistent with the `match.ss` library (see section 15.2.15). The `define-structure` and `define-const-structure` forms expand into `define-struct` forms. While `define-const-structure` and the mutability annotations are supported, immutable fields are not actually immutable.