It's impossible to check syntax without executing BEGIN blocks. The code in in BEGIN blocks including used modules can affect the parsing of subsequent code.

e.g. Does
$x = func + 2;
mean
$x = func() + 2;
or
$x = func(2);
or is it a syntax error such as
Not enough arguments

It could be any of the three. There's no way to know which without loading the module and calling it's import function from a BEGIN block.

Update: Added substantiation in the form of an example.

In reply to Re: perl -c and BEGIN block by ikegami
in thread perl -c and BEGIN block by dgaramond2

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