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ReadMode 1;
# some stuff
ReadMode 2;

testcall 1;
testcall(2);
...
    print $_[0];
    print "\n";
}

Number found where operator expected at fcall.pl line 1, near "testcal
+l 1"
        (Do you need to predeclare testcall?)
syntax error at fcall.pl line 1, near "testcall 1"
Execution of fcall.pl aborted due to compilation errors.

callsub();
sub callsub{#dostuff}

sub callsub(){#dostuff}
callsub();