$ perl -e " $foo=[]; push $foo, 1 "
Type of arg 1 to push must be array (not scalar dereference) at -e lin
+e 1, at EOF
Execution of -e aborted due to compilation errors.

$ perl -Mdiagnostics -e " $foo=[]; push $foo, 1 "
Type of arg 1 to push must be array (not scalar dereference) at -e lin
+e 1, at EOF
Execution of -e aborted due to compilation errors (#1)
    (F) This function requires the argument in that position to be of 
+a
    certain type.  Arrays must be @NAME or @{EXPR}.  Hashes must be
    %NAME or %{EXPR}.  No implicit dereferencing is allowed--use the
    {EXPR} forms as an explicit dereference.  See perlref.

Uncaught exception from user code:
        Type of arg 1 to push must be array (not scalar dereference) a
+t -e line 1, at EOF
Execution of -e aborted due to compilation errors.
 at -e line 1

$ splain
Type of arg 1 to push must be array (not scalar dereference) at -e lin
+e 1, at EOF
Type of arg 1 to push must be array (not scalar dereference) at -e lin
+e 1, at
        EOF (#1)
    (F) This function requires the argument in that position to be of 
+a
    certain type.  Arrays must be @NAME or @{EXPR}.  Hashes must be
    %NAME or %{EXPR}.  No implicit dereferencing is allowed--use the
    {EXPR} forms as an explicit dereference.  See perlref.

^Z
[download]