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try.

try. B0 catch. B1 catchd. B2 catcht. B3 end.
The try/catch control structure may contain one or more distinct occurrences of catch. catchd. catcht. , in any order. For example: 
try. B0 catch. B1 end.
try. B0 catcht. B1 catchd. B2 end.
try. B0 catcht. B1 catch. B2 catchd. B3 end.
The B0 block is executed and:
• catch. catches errors, whatever the setting of the debug flag 13!:0
• catchd. catches errors, but only if the debug flag is 0
• catcht. catches a throw.
 

For example:
f=: 4 : 0
 try.
  try. 3+y. catch. *:x. end.
 catch.
  'x and y are both bad'
 end.
)

   13 f 7
10

   13 f 'primogeniture'
169

   'sui' f 'generis'
x and y are both bad

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