extend def.n of interior mutability #59
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reference/src/glossary.md
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| #### Interior mutability | |||
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| *Interior Mutability* means mutating memory where there also exists a live shared reference immediately (i.e., non-transitively) pointing to the same memory. | |||
| This propagates recursively through references, but not through raw pointers. | |||
| *Interior Mutability* means mutating memory where there also exists a live shared reference pointing to the same memory; or mutating memory through a pointer derived from a shared reference. | |||
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grammatical nit: I believe this is a definition of "interior mutation". I guess interior mutability is the ability to do interior mutation without it being UB.
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We usually also disallow mutating through pointers obtained from shared references. That's a separate condition from there being live shared references.
See https://internals.rust-lang.org/t/writing-through-a-pointer-derived-from-a-shared-reference-after-that-reference-is-dead/9078 for how this might matter.