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doc cenum_impl_drop_cast #1713

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Feb 6, 2025
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doc cenum_impl_drop_cast #1713

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2b37679
doc `cenum_impl_drop_cast`
ickk Jan 14, 2025
4675c25
Update now that cenum_impl_drop_cast is a hard error
ehuss Feb 4, 2025
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4 changes: 4 additions & 0 deletions src/expressions/operator-expr.md
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Original file line number Diff line number Diff line change
Expand Up @@ -586,6 +586,7 @@ halfway between two floating point numbers.
r[expr.as.enum]
#### Enum cast

r[expr.as.enum.discriminant]
Casts an enum to its discriminant, then uses a numeric cast if needed.
Casting is limited to the following kinds of enumerations:

Expand All @@ -599,6 +600,9 @@ assert_eq!(Enum::B as i32, 1);
assert_eq!(Enum::C as i32, 2);
```

r[expr.as.enum.no-drop]
Casting is not allowed if the enum implements [`Drop`].

r[expr.as.bool-char-as-int]
#### Primitive to integer cast

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