Deprecated syntax

Reports the use of the syntax deprecated from Ruby 1.9. For example, : instead of then for one-line if, when, unless.

Example:

condition = true
if condition: 1 else 0 # -> if condition then 1 else 0
unless condition: 0 else 1 # -> unless condition then 0 else 1

value = 1
case value
when 1: true # -> when 1 then true
end

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

RubyDeprecatedSyntaxInspection

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Ruby | Language level migration aids

Inspection ID: RubyDeprecatedSyntaxInspection

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection RubyDeprecatedSyntaxInspection

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

RubyMine 2025.2

Inspection Details
By default bundled with:	Qodana for Ruby 2025.2, RubyMine 2025.2,

Last modified: 18 September 2025