Mantis#1801. Thank you kindly, Junta_Kohime for a patch that:

I found a problem trying to get s value directly from a quaternion q.
Compiling a script which directly access to q.s value, caused the 
following error:
CS0103: 'The . symbol cannot be used in LSL except in float values 
or vector components'. Detected around: q.s
I did a small change to allow alphabetic letter "s" to be interpretated 
as valid identifier. This solves the problem.

1 files changed, 1 insertions, 1 deletions

diff --git a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/LSL2CSConverter.cs b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/LSL2CSConverter.cs
index 1613502..371ba45 100644
--- a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/LSL2CSConverter.cs
+++ b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/LSL2CSConverter.cs
@@ -124,7 +124,7 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine.Compiler.LSL
             Match SecurityM;
 
 
-            SecurityM = Regex.Match(checkscript, @"([a-zA-Z])\.(?:[a-wA-Z]|[a-zA-Z][a-zA-Z])", RegexOptions.Compiled | RegexOptions.Multiline | RegexOptions.Singleline);
+            SecurityM = Regex.Match(checkscript, @"([a-zA-Z])\.(?:[a-rt-wA-Z]|[a-zA-Z][a-zA-Z])", RegexOptions.Compiled | RegexOptions.Multiline | RegexOptions.Singleline);
             if (SecurityM.Success)
                throw new Exception("CS0103: 'The . symbol cannot be used in LSL except in float values or vector components'.  Detected around: " + SecurityM.Captures[0].Value);