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### Describe the bug
```
struct MyStruct {
mut:
list []string
}
fn main() {
a := MyStruct{ ["aaa"] }
// a.list[0] = "### MUTATION ###" // error: `a` is immutable, declare …
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```
error D2L0066: The class "" is missing the [Immutable] attribute, so it isn't safe to be held by an immutable type
```
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concept from FP.
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`SuperEditor` has moved to an edit pipeline through an `Editor`. As a result, it's never acceptable to alter a `Document` or `DocumentNode` directly. Changes need to happen within `EditCommand`s.
…
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Is it possible for edgedb to have an immutable mode where data is append-only? It can allow for "time-travelling" through the data to see it's state as it changes with time.
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BPO | [33474](https://bugs.python.org/issue33474)
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Nosy | @ericvsmith
*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.…
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In Heptapod by bitbucket_importer on Jun 2, 2017, 17:24
*Created originally on Bitbucket by [antocuni (Antonio Cuni)](https://bitbucket.org/[7.3.7](https://github.com/gitlab-importer/pypy/milestone/7…
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This proposal is based on a paper called ["Uniqueness and Reference Immutability for Safe Parallelism"](https://research.microsoft.com/pubs/170528/msr-tr-2012-79.pdf) that has [surfaced on Slashdot](h…
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While no changes are made to the Model state, from the code after the construction, may be it's better to ensure in this fact by using some mutability-locks.
See http://facebook.github.io/react/docs…