The following are the results of running
if(one = 22) then a = b; c = d; e = f in Q&A, per your request.
=================================
IF one=19 then
a=""
c=d
e=f
==================
IF one=22 then
a=b
c=d
e=f
==================
Conclusion:
Q&A:
if(one = 22) then a = b; c = d; e = f

is the same as

Sesame: 
if(one = 22) then {a = b}
c = d
e = f
==================
Additional info:
Q&A database translated into Sesame with no errors, and results calculated same as in Q&A.  Program came in as if(one = 22) then a = b; c = d; e = f

Sesame calculated like:
if(one = 22) then {a = b}
c = d
e = f

It did not calculate like:
if(one = 22) then { a = b; c = d; e = f }
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Still need to find you a sample that gives no compile error, but does not work right........stay tuned.....