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Deprecate builtin EMPTY_MACRO_SLOT for optional macro arguments (#2805)

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* add deprecations to macro slot builtins

* refactor all stdlib uses of now-deprecated EMPTY_MACRO_SLOT; release notes

* update incorrect releasenotes ref to this pr

* remove leftover comments from refactoring

* remove unnecessary `EmptySlot`-like type in countingsort; use private macro directly
This commit is contained in:
Zack Puhl
2026-01-23 06:34:50 -05:00
committed by GitHub
parent 0e69432e3d
commit 5e1c343be4
8 changed files with 237 additions and 233 deletions
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12
lib/std/core/builtin.c3
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@@ -24,11 +24,15 @@ macro foo(a, #b = EMPTY_MACRO_SLOT)
$endif
}
*>
const EmptySlot EMPTY_MACRO_SLOT @builtin = null;
const EmptySlot EMPTY_MACRO_SLOT @builtin @deprecated("Use `#arg = ...` instead.") = null;
typedef EmptySlot = void*;
macro bool @is_empty_macro_slot(#arg) @const @builtin => $typeof(#arg) == EmptySlot;
macro bool @is_valid_macro_slot(#arg) @const @builtin => $typeof(#arg) != EmptySlot;
macro bool @is_empty_macro_slot(#arg) @const @builtin
@deprecated("Use `#arg = ...` to define an optional macro slot, and `$defined(#arg)` to detect whether the argument is set.")
=> $typeof(#arg) == EmptySlot;
macro bool @is_valid_macro_slot(#arg) @const @builtin
@deprecated("Use `#arg = ...` to define an optional macro slot, and `$defined(#arg)` to detect whether the argument is set.")
=> $typeof(#arg) != EmptySlot;
<*
Returns a random value at compile time.
@@ -453,7 +457,7 @@ macro @prefetch(void* ptr, PrefetchLocality $locality = VERY_NEAR, bool $write =
<*
Shuffle a vector by its index
int[<4>] a = { 1, 2, 3, 4 };
assert(swizzle(a, 0, 1, 1, 3) == (int[<4>]) { 1, 2, 2, 4 });
*>