id: ruby-symbol-to-proc-candidate
valid:
  - "names.each { |name| puts name }"
  - "names.map { |name| name.upcase(prefix) }"
  - "names.map { |name| name.(1) }"
  - "names.map(&:upcase)"
  - "names.map { |name| name.() }"
invalid:
  - "names.map { |name| name.upcase }"
  - "names.select { |name| name.empty? }"