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d00e93c82c
Fixes: https://github.com/Roblox/luau/issues/913 This PR adds support for type refinements around guard clauses that use `break` and `continue` statements inside a loop, similar to how guard clauses with `return` is supported. I had some free time today, so I figure I'd give a shot at a naïve fix for this at the very least. --- ## Resulting Change: Luau now supports type refinements within loops where a `continue` or `break` guard clause was used. For example: ```lua for _, object in objects :: {{value: string?}} do if not object.value then continue end local x: string = object.value -- OK; Used to emit "Type 'string?' could not be converted into 'string'" end ``` --------- Co-authored-by: Alexander McCord <amccord@roblox.com>
36 lines
688 B
C++
36 lines
688 B
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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#include <memory>
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namespace Luau
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{
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struct Scope;
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using ScopePtr = std::shared_ptr<Scope>;
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enum class ControlFlow
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{
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None = 0b00001,
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Returns = 0b00010,
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Throws = 0b00100,
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Breaks = 0b01000,
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Continues = 0b10000,
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};
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inline ControlFlow operator&(ControlFlow a, ControlFlow b)
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{
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return ControlFlow(int(a) & int(b));
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}
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inline ControlFlow operator|(ControlFlow a, ControlFlow b)
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{
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return ControlFlow(int(a) | int(b));
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}
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inline bool matches(ControlFlow a, ControlFlow b)
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{
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return (a & b) != ControlFlow(0);
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}
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} // namespace Luau
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