Just for convenient reference:

The standard ways to help Perl interpret expression (hash ref) vs. block correctly, is like this: 

map +{ "$_" => 1 }, @list   # + => expression (hash ref) (+ comma)
map {; "$_" => 1 } @list    # ; => block (no comma)

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In reply to Re^3: Error with doublequotes in map by bart
in thread Error with doublequotes in map by Anonymous Monk

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