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# a block returning a list of two elements,
# but perl thinks it's an anonymous hash
%hash = map { "$_", 2 } @l;

# an anonymous hash, but perl thinks it's a block
@hash_refs = map { $_, 2 }, @l;

# force parsing as a block
%hash = map { +"$_", 2 } @l;
%hash = map { ; "$_", 2 } @l;
...

# force parsing as an anonymous hash
@hash_refs = map +{ $_, 2 }, @l;