2.5. Let expression

There is a short form for match expressions. An expression of the form:
  let letpat = expr1 in expr2
is equivalent to
  match expr1 with letpat => expr2 endmatch
The let expression is, in effect, a prefix operator with the lowest precedence.
Start felix section to tut/examples/tut_beg208.flx[1 /1 ]
     1: #line 3091 "./lpsrc/flx_tutorial.pak"
     2: #import <flx.flxh>
     3: print (match 1 with | ?x =>  x + x endmatch); endl;
     4: print (let ?z = 1 in z + z); endl;
     5: print (let ?x = (let ?y = 2 in y + y) in x + x); endl; // 8
     6: 
End felix section to tut/examples/tut_beg208.flx[1]