Change lane:join() return values

* when no error is raised in the lane, lane:join() now precedes the lane returned values with true
* lane body is no longer forced to return something when used with join()
* adjusted all relevant unit tests accordingly

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/launchtest.lua b/tests/launchtest.lua
index 57411e1..cdd6ffc 100644
--- a/tests/launchtest.lua
+++ b/tests/launchtest.lua
@@ -69,8 +69,8 @@ else
     io.stderr:write( N.." lanes launched.\n" )
     
     for i=1,N do
-        local rc= t[i]:join()
-        assert( rc==i )
+        local r,rc = t[i]:join()
+        assert( r == true and rc == i )
     end
 
     io.stderr:write( N.." lanes finished.\n" )