Change vectorlike from struct to union

* src/lisp.h (vectorlike_headed): Change from struct to union.
All uses changed.  Since it has only one member, this does not
change semantics.  This is designed to simplify future changes
needed to fix bugs like Bug#29040.  All uses changed.

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/lispref/internals.texi b/doc/lispref/internals.texi
index 663d0fd92b9..b0348e74d47 100644
--- a/doc/lispref/internals.texi
+++ b/doc/lispref/internals.texi
@@ -248,7 +248,7 @@ of 8k bytes, and small vectors are packed into blocks of 4k bytes).
 @cindex storage of vector-like Lisp objects
   Beyond the basic vector, a lot of objects like window, buffer, and
 frame are managed as if they were vectors.  The corresponding C data
-structures include the @code{struct vectorlike_header} field whose
+structures include the @code{union vectorlike_header} field whose
 @code{size} member contains the subtype enumerated by @code{enum pvec_type}
 and an information about how many @code{Lisp_Object} fields this structure
 contains and what the size of the rest data is.  This information is
@@ -1085,7 +1085,7 @@ Some of the fields of @code{struct buffer} are:
 
 @table @code
 @item header
-A header of type @code{struct vectorlike_header} is common to all
+A header of type @code{union vectorlike_header} is common to all
 vectorlike objects.
 
 @item own_text