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$ perl -c -e'my $x = if (f()) { g(); } else { h(); }'
syntax error at -e line 1, near "= if"
...
$ perl -e'my $x = unless (f()) { g(); } else { h(); }'
syntax error at -e line 1, near "= unless"
-e had compilation errors.

$ perl -c -e'my $x = ( f() and g() );'
-e syntax OK
...
$ perl -c -e'my $x = ( if (f()) { g() } );'
syntax error at -e line 1, near "( if"
-e had compilation errors.