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https://github.com/ton-blockchain/ton
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f3e620f48c
This commit introduces nullable types `T?` that are distinct from non-nullable `T`. Example: `int?` (int or null) and `int` are different now. Previously, `null` could be assigned to any primitive type. Now, it can be assigned only to `T?`. A non-null assertion operator `!` was also introduced, similar to `!` in TypeScript and `!!` in Kotlin. If `int?` still occupies 1 stack slot, `(int,int)?` and other nullable tensors occupy N+1 slots, the last for "null precedence". `v == null` actually compares that slot. Assigning `(int,int)` to `(int,int)?` implicitly creates a null presence slot. Assigning `null` to `(int,int)?` widens this null value to 3 slots. This is called "type transitioning". All stdlib functions prototypes have been updated to reflect whether they return/accept a nullable or a strict value. This commit also contains refactoring from `const FunctionData*` to `FunctionPtr` and similar.
16 lines
329 B
Text
16 lines
329 B
Text
fun incrementOrSetNull(mutate x: int?) {
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if (random()) { x! += 1; }
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else { x = null; }
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}
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fun cantCallMutateMethodNotNullable() {
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var x = 1;
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incrementOrSetNull(mutate x);
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return x;
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}
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/**
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@compilation_should_fail
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@stderr can not pass `int` to mutate `int?`
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@stderr because mutation is not type compatible
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*/
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