It was stated only in :h perl-overview alongside with other examples.
# HG changeset patch
# User ZyX <[email protected]>
# Date 1351072849 -14400
# Node ID 6f110cb9089b4c875af465d136229a3154425212
# Parent 57e8b75298d6b6e9ef899af66c79a22cb6334988
Added information about returning value of VIM::Eval in scalar context
diff -r 57e8b75298d6 -r 6f110cb9089b runtime/doc/if_perl.txt
--- a/runtime/doc/if_perl.txt Tue Oct 23 05:35:09 2012 +0200
+++ b/runtime/doc/if_perl.txt Wed Oct 24 14:00:24 2012 +0400
@@ -175,7 +175,8 @@
VIM::DoCommand({cmd}) Executes Ex command {cmd}.
*perl-Eval*
-VIM::Eval({expr}) Evaluates {expr} and returns (success, val).
+VIM::Eval({expr}) Evaluates {expr} and returns (success, value) in list
+ context or just value in scalar context.
success=1 indicates that val contains the value of
{expr}; success=0 indicates a failure to evaluate
the expression. '@x' returns the contents of register
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*** /tmp/extdiff.ZgfgXr/vim.57e8b75298d6/runtime/doc/if_perl.txt 2012-10-24 14:00:46.000000000 +0400
--- vim.6f110cb9089b/runtime/doc/if_perl.txt 2012-10-24 14:00:46.000000000 +0400
***************
*** 175,181 ****
VIM::DoCommand({cmd}) Executes Ex command {cmd}.
*perl-Eval*
! VIM::Eval({expr}) Evaluates {expr} and returns (success, val).
success=1 indicates that val contains the value of
{expr}; success=0 indicates a failure to evaluate
the expression. '@x' returns the contents of register
--- 175,182 ----
VIM::DoCommand({cmd}) Executes Ex command {cmd}.
*perl-Eval*
! VIM::Eval({expr}) Evaluates {expr} and returns (success, value) in list
! context or just value in scalar context.
success=1 indicates that val contains the value of
{expr}; success=0 indicates a failure to evaluate
the expression. '@x' returns the contents of register
