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% perl -MO=Concise -e 'print qq{hello, world}'
6  <@> leave[1 ref] vKP/REFC ->(end)
...
5     <@> print vK ->6
3        <0> pushmark s ->4
4        <$> const(PV "hello, world") s ->5

% perl -MO=Concise -e 'print q{hello, world}'
6  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
...
3        <0> pushmark s ->4
4        <$> const(PV "hello, world") s ->5
-e syntax OK

% perl -MO=Concise -e 'print qq{hello, $world\n}'
a  <@> leave[1 ref] vKP/REFC ->(end)
...
5                    <$> gvsv(*world) s ->6
7              <$> const(PV "\n") s ->8
-e syntax OK

% perl -MO=Concise -e 'print qq{hello, } . $world . qq{\n}'
a  <@> leave[1 ref] vKP/REFC ->(end)
...
5                 <$> gvsv(*world) s ->6
7           <$> const(PV "\n") s ->8
-e syntax OK