return join(iterable(first, second, rest));
  }

  /**
   * Returns a joiner with the same behavior as this one, except automatically substituting {@code
   * nullText} for any provided null elements.
   */
  public Joiner useForNull(String nullText) {
    checkNotNull(nullText);
    return new Joiner(this) {
      @Override

			}
			smap := makeSubstMap(ytparams, targs)

			var check *Checker   // ok to call subst on a nil *Checker
			ctxt := NewContext() // need a non-nil Context for the substitution below

			// Constraints must be pair-wise identical, after substitution.
			for i, xtparam := range xtparams {
				ybound := check.subst(nopos, ytparams[i].bound, smap, nil, ctxt)
				if !c.identical(xtparam.bound, ybound, p) {
					return false

#
# In Bash we could simply go:
#
#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
#   set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse

#
# In Bash we could simply go:
#
#   readarray ARGS < <( xargs -n1 <<<"\$var" ) &&
#   set -- "\${ARGS[@]}" "\$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse

			}
			smap := makeSubstMap(ytparams, targs)

			var check *Checker   // ok to call subst on a nil *Checker
			ctxt := NewContext() // need a non-nil Context for the substitution below

			// Constraints must be pair-wise identical, after substitution.
			for i, xtparam := range xtparams {
				ybound := check.subst(nopos, ytparams[i].bound, smap, nil, ctxt)
				if !c.identical(xtparam.bound, ybound, p) {
					return false

import org.jetbrains.kotlin.fir.psi
import org.jetbrains.kotlin.fir.renderer.FirRenderer
import org.jetbrains.kotlin.fir.resolve.SessionHolderImpl
import org.jetbrains.kotlin.fir.resolve.substitution.substitutorByMap
import org.jetbrains.kotlin.fir.resolve.toSymbol
import org.jetbrains.kotlin.fir.symbols.impl.*
import org.jetbrains.kotlin.fir.symbols.lazyResolveToPhase
import org.jetbrains.kotlin.fir.types.*

        """


        when: fails()
        then: failure.assertHasCause("Cannot change resolution strategy of dependency configuration ':a' after it has been resolved")
    }

    def "does not allow changing substitution rules on a configuration that has been resolved"() {
        buildFile << """
            configurations { a }
            configurations.a.resolve()

    bind(buildServiceProviderCodec)
    bind(flowProvidersCodec)
    bind(BeanCodec)
}.build()


/**
 * This is not used directly when encoding or decoding the object graph. This codec takes care of substituting a provider whose
 * value is known at configuration time with a fixed value.
 */
class FixedValueReplacingProviderCodec(

    private
    val providerWithChangingValueCodec: Codec<Any?>

) {

    }

    /**
     * This test illustrates that published modules can declare capabilities, which are then discovered
     * as we visit the graph. But using a module substitution rule, we can fix the problem.
     */

    @RequiredFeature(feature = GradleMetadataResolveRunner.GRADLE_METADATA, value = "true")

import org.jetbrains.kotlin.fir.references.FirResolvedNamedReference
import org.jetbrains.kotlin.fir.references.FirSuperReference
import org.jetbrains.kotlin.fir.resolve.constructFunctionType
import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
import org.jetbrains.kotlin.fir.types.*
import org.jetbrains.kotlin.fir.utils.exceptions.withFirEntry
import org.jetbrains.kotlin.lexer.KtTokens