Why are structs in Swift said to be immutable?

[Jumhyn (Frederick Kellison-Linn)]

See this thread:

SE-0268: Refine didSet Semantics

The review of SE-0268 — Refine didSet Semantics begins now and runs through October 31, 2019. Reviews are an important part of the Swift evolution process. All review feedback should be either on this forum thread or, if you would like to keep your feedback private, directly to the review manager (via email or direct message in the Swift forums). What goes into a review of a proposal? The goal of the review process is to improve the proposal under review through constructive criticism and, ev…