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langref: remove incorrect statement on c_void

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c_void is *not* simply `const c_void = opaque{};`. It has unique
semantics as any pointer type may coerce to `*c_void` which is not true
for an arbitrary `*opaque{}`.
This commit is contained in:
Isaac Freund
2021-07-20 01:47:53 +02:00
committed by Andrew Kelley
parent c1e444b07c
commit 2561b1eb67
1 changed files with 2 additions and 3 deletions
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doc/langref.html.in
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@@ -5634,9 +5634,8 @@ test "turn HashMap into a set with void" {
value is deleted, as seen above.
</p>
<p>
{#syntax#}void{#endsyntax#} is distinct from {#syntax#}c_void{#endsyntax#}, which is defined like this:
{#syntax#}pub const c_void = opaque {};{#endsyntax#}.
{#syntax#}void{#endsyntax#} has a known size of 0 bytes, and {#syntax#}c_void{#endsyntax#} has an unknown, but non-zero, size.
{#syntax#}void{#endsyntax#} is distinct from {#syntax#}c_void{#endsyntax#}.
{#syntax#}void{#endsyntax#} has a known size of 0 bytes, and {#syntax#}c_void{#endsyntax#} has an unknown, but non-zero, size.
</p>
<p>
Expressions of type {#syntax#}void{#endsyntax#} are the only ones whose value can be ignored. For example: