% perl -MO=Concise -e 'print qq{hello, world}'
6  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
5     <@> print vK ->6
3        <0> pushmark s ->4
4        <$> const(PV "hello, world") s ->5

##</code><code>##

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

##</code><code>##

% perl -MO=Concise -e 'print qq{hello, $world\n}'
a  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
9     <@> print vK ->a
3        <0> pushmark s ->4
-        <1> ex-stringify sK/1 ->9
-           <0> ex-pushmark s ->4
8           <2> concat[t2] sKS/2 ->9
6              <2> concat[t1] sK/2 ->7
4                 <$> const(PV "hello, ") s ->5
-                 <1> ex-rv2sv sK/1 ->6
5                    <$> gvsv(*world) s ->6
7              <$> const(PV "\n") s ->8
-e syntax OK

##</code><code>##

% perl -MO=Concise -e 'print qq{hello, } . $world . qq{\n}'
a  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
9     <@> print vK ->a
3        <0> pushmark s ->4
8        <2> concat[t4] sKS/2 ->9
6           <2> concat[t2] sK/2 ->7
4              <$> const(PV "hello, ") s ->5
-              <1> ex-rv2sv sK/1 ->6
5                 <$> gvsv(*world) s ->6
7           <$> const(PV "\n") s ->8
-e syntax OK