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, 3 insertions, 3 deletions

diff --git a/tests/rupval.lua b/tests/rupval.lua
index ad5ad9d..c6743b3 100644
--- a/tests/rupval.lua
+++ b/tests/rupval.lua
@@ -26,17 +26,17 @@ end
 local g = lanes.gen( "base", { name = 'auto' }, a)
 
 local l = g(7)
-local r = l:join()
+local _, r = l:join()
 assert(r == y)
 print(r)
 
 local l = g(8)
-local r = l:join()
+local _, r = l:join()
 assert(r == z)
 print(r)
 
 local l = g(9)
-local r = l:join()
+local _, r = l:join()
 assert(r == x)
 print(r)