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* A small subset of control-flow refinements have been added to recognize type options that are unreachable after a conditional/unconditional code block. (Fixes https://github.com/Roblox/luau/issues/356). Some examples: ```lua local function f(x: string?) if not x then return end -- x is 'string' here end ``` Throwing calls like `error` or `assert(false)` instead of 'return' are also recognized. Existing complex refinements like type/typeof and tagged union checks are expected to work, among others. To enable this feature, `LuauTinyControlFlowAnalysis` exclusion has to be removed from `ExperimentalFlags.h`. If will become enabled unconditionally in the near future. * Linter has been integrated into the typechecker analysis so that type-aware lint warnings can work in any mode `Frontend::lint` methods were deprecated, `Frontend::check` has to be used instead with `runLintChecks` option set. Resulting lint warning are located inside `CheckResult`. * Fixed large performance drop and increased memory consumption when array is filled at an offset (Fixes https://github.com/Roblox/luau/issues/590) * Part of [Type error suppression RFC](https://github.com/Roblox/luau/blob/master/rfcs/type-error-suppression.md) was implemented making subtyping checks with `any` type transitive. --- In our work on the new type-solver: * `--!nocheck` mode no longer reports type errors * New solver will not be used for `--!nonstrict` modules until all issues with strict mode typechecking are fixed * Added control-flow aware type refinements mentioned earlier In native code generation: * `LOP_NAMECALL` has been translated to IR * `type` and `typeof` builtin fastcalls have been translated to IR/assembly * Additional steps were taken towards arm64 support
28 lines
974 B
C++
28 lines
974 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 <string.h>
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namespace Luau
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{
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inline bool isFlagExperimental(const char* flag)
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{
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// Flags in this list are disabled by default in various command-line tools. They may have behavior that is not fully final,
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// or critical bugs that are found after the code has been submitted.
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static const char* const kList[] = {
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"LuauInstantiateInSubtyping", // requires some fixes to lua-apps code
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"LuauTypecheckTypeguards", // requires some fixes to lua-apps code (CLI-67030)
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"LuauTinyControlFlowAnalysis", // waiting for updates to packages depended by internal builtin plugins
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// makes sure we always have at least one entry
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nullptr,
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};
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for (const char* item : kList)
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if (item && strcmp(item, flag) == 0)
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return true;
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return false;
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}
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} // namespace Luau
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