In Ruby, What structures can a `rescue` statement be nested in
You can only use rescue in two cases:
Within a
begin ... endblockbegin raiserescue nilendAs a statement modifier
i = raise rescue nil
Function, module, and class bodies (thanks Jörg) are implicit begin...end blocks, so you can rescue within any function without an explicit begin/end.
def foo raise rescue nil endThe block form takes an optional list of parameters, specifying which exceptions (and descendants) to rescue:
begin eval string rescue SyntaxError, NameError => boom print "String doesn't compile: " + boom rescue StandardError => bang print "Error running script: " + bang endIf called inline as a statement modifier, or without argument within a begin/end block, rescue will catch StandardError and its descendants.
Here's the 1.9 documentation on rescue.
As said in recent comment, response has changed since Ruby 2.5.
do ... end blocks are now implicit begin ... end blocks; like module, class and method bodies.
In-line blocks {...} still can't.