D30507.diff
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	diff --git a/share/man/man9/style.9 b/share/man/man9/style.9
	--- a/share/man/man9/style.9
	+++ b/share/man/man9/style.9
	@@ -746,9 +746,10 @@
	!(p = f())
	.Ed
	.Pp
	-Do not use
	+Do not test without a comparison, or with unary
	.Ic \&!
	-for tests unless it is a boolean, e.g., use:
	+(except for booleans).
	+For example, use:
	.Bd -literal
	if (*p == '\e0')
	.Ed
	@@ -758,6 +759,16 @@
	if (!*p)
	.Ed
	.Pp
	+Prefer:
	+.Bd -literal
	+if (count != 0)
	+.Ed
	+.Pp
	+over:
	+.Bd -literal
	+if (count)
	+.Ed
	+.Pp
	Routines returning
	.Vt "void *"
	should not have their return values cast