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support cstring in case (#20130)

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* implement case for cstring

for now just converts to string on C backend

* custom implementation for cstring

* remove leftover

* revert even more

* add nil + fix packages weird variant literal bug

* update docs
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metagn 2022-09-01 19:10:00 +03:00 • committed by GitHub
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doc/manual.md
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@ -1432,6 +1432,8 @@ it can be modified:
s[0] = 'u' # This is ok
```
`cstring` values may also be used in case statements like strings.
Structured types
----------------
A variable of a structured type can hold multiple values at the same
@ -3098,6 +3100,9 @@ This holds only for expressions of ordinal types.
"All possible values" of `expr` are determined by `expr`'s type.
To suppress the static error an `else: discard` should be used.
Only ordinal types, floats, strings and cstrings are allowed as values
in case statements.
For non-ordinal types, it is not possible to list every possible value and so
these always require an `else` part.
An exception to this rule is for the `string` type, which currently doesn't