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langref: improve zero bit types documentation #14385

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langref: improve zero bit types documentation #14385

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5 changes: 4 additions & 1 deletion doc/langref.html.in
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Expand Up @@ -6627,7 +6627,7 @@ test "peer type resolution: *const T and ?*T" {
<li>{#link|Arrays#} and {#link|Vectors#} with len 0, or with an element type that is a zero bit type.</li>
<li>An {#link|enum#} with only 1 tag.</li>
<li>A {#link|struct#} with all fields being zero bit types.</li>
<li>A {#link|union#} with only 1 field which is a zero bit type.</li>
<li>An {#link|union#} with all fields being zero bit types.</li>
</ul>
<p>
These types can only ever have one possible value, and thus
Expand All @@ -6650,6 +6650,9 @@ export fn entry() void {
15: c3 retq </code></pre>
<p>These assembly instructions do not have any code associated with the void values -
they only perform the function call prologue and epilogue.</p>
<p>Using empty {#link|struct#}, empty {#link|enum#}, empty {#link|union#},
and empty {#link|Error Set Type#} is problematic, and may be a compile error in the future.
For details on this subscribe to <a href="https://github.com/ziglang/zig/issues/13807">this issue</a>.

{#header_open|void#}
<p>
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