#[]                   # error: standalone attribute sequence
#[foo]                # error: standalone attribute sequence
#[[]                  # error: expected name instead of '['
#[foo                 # error: expected ']' instead of <newline>
#[dir/file{foo}]      # error: invalid attribute key
#[foo=dir/file{bar}]  # error: invalid attribute key

#[foo] print hello    # error: attributes before print
#[foo]./              # error: attributes before directory scope
#{
#}
#[foo]./:             # error: attributes before target scope
#./: [foo] buildfile  # error: attributes before prerequisites
#import [foo] libz    # error: attributes without variable

#foo="F[O]O"
#[{x y z}]
#[$foo]
#["[]"]

./: