cannot disable NonUnitStatement when being used with scala-maven-plugin

[tribbloid]

• Severity: Blocker

• How to reproduce:

When using with scala-maven-plugin, The option NonUnitStatement cannot be disabled:

The following plugin configuration:

  <plugin>
    <groupId>net.alchim31.maven</groupId>
    <artifactId>scala-maven-plugin</artifactId>
    <version>3.3.1</version>
    <executions>
      <execution>
        <id>scala-compile-first</id>
        <phase>process-resources</phase>
        <goals>
          <goal>compile</goal>
        </goals>
      </execution>
      <execution>
        <id>scala-test-compile-first</id>
        <phase>process-test-resources</phase>
        <goals>
          <goal>testCompile</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <scalaVersion>${scala.version}</scalaVersion>
      <scalaCompatVersion>${scala.binary.version}</scalaCompatVersion>
      <recompileMode>incremental</recompileMode>
      <useZincServer>true</useZincServer>
      <!--https://tpolecat.github.io/2017/04/25/scalac-flags.html-->
      <args>
        <arg>-target:jvm-${java.version}</arg>
        <arg>-unchecked</arg>
        <arg>-deprecation</arg>
        <arg>-feature</arg>
        <arg>-g:vars</arg>
        <!--<arg>-language:existentials</arg> &lt;!&ndash; often used in project &ndash;&gt;-->

        <arg>-encoding</arg>
        <arg>UTF-8</arg>
        <arg>-language:_</arg>
        <arg>-Xfatal-warnings</arg>
        <arg>-Xlint</arg>
        <arg>-Yno-adapted-args</arg>
        <arg>-Ywarn-dead-code</arg> <!--,        // N.B. doesn't work well with the ??? hole -->
        <arg>-Ywarn-numeric-widen</arg>
        <arg>-Ywarn-value-discard</arg>
        <arg>-Xfuture</arg>

        <arg>-Ypartial-unification</arg>
        <arg>-Ywarn-numeric-widen</arg>        <!--      // Warn when numerics are widened. -->
        <arg>-Ynon-unit-statement</arg>
        <arg>-P:wartremover:only-warn-traverser:org.wartremover.warts.Unsafe</arg>
      </args>

      <javacArgs>
        <javacArg>-source</javacArg>
        <javacArg>${java.version}</javacArg>
        <javacArg>-target</javacArg>
        <javacArg>${java.version}</javacArg>
      </javacArgs>

      <compilerPlugins>
        <compilerPlugin>
          <groupId>org.wartremover</groupId>
          <artifactId>wartremover_${scala.binary.version}</artifactId>
          <version>2.2.1</version>
        </compilerPlugin>

        <compilerPlugin>
          <groupId>com.olegpy</groupId>
          <artifactId>better-monadic-for_${scala.binary.version}</artifactId>
          <version>0.2.4</version>
        </compilerPlugin>
      </compilerPlugins>
      <excludes>
        <exclude>**/.ipynb_checkpoints/*</exclude>
      </excludes>
    </configuration>
  </plugin>

Will simply yield the following error information:

[ERROR] bad option: '-Ynon-unit-statement'

Many test cases rely on this feature, it has to be enabled before other features can be invoked.