Kotlin destructuring declarations highlighted as syntax error

[SebastianAigner]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

The following valid Kotlin code:

fun fromString(s: String): Passport {
    val fieldsAndValues = s.split(" ", "\n", "\r\n")
    val map = fieldsAndValues.associate {
        val (key, value) = it.split(":")
        key to value
    }
    return Passport(map)
}

is rendered as such:

It seems that Chroma currently doesn't understand Kotlin destructuring declarations.

To Reproduce

See the playground.

[alecthomas]

FYI: Chroma lexers are maintained by the community.

[jaller94]

Ideas:

• Either change this rule to push a state of a new type property-or-property-group

  • chroma/lexers/embedded/kotlin.xml

    Lines 163 to 169 in fe5dde8

    	<rule pattern="(val|var)(\s+)">
    	<bygroups>
    	<token type="Keyword"/>
    	<token type="Text"/>
    	</bygroups>
    	<push state="property"/>
    	</rule>

• Or allow property to be a group.

  • chroma/lexers/embedded/kotlin.xml

    Lines 47 to 56 in fe5dde8

    	<state name="property">
    	<rule pattern="\x60[^\x60]+?\x60">
    	<token type="NameProperty"/>
    	<pop depth="1"/>
    	</rule>
    	<rule pattern="(?:[_\p{L}][\p{L}\p{N}]*|`@?[_\p{L}][\p{L}\p{N}]+`)">
    	<token type="NameProperty"/>
    	<pop depth="1"/>
    	</rule>
    	</state>