ComponentSelectionReason reason, ModuleVersionResolveException failure) {
        List<Object> key = asList(requested, from, constraint);
        if (!unresolvedDependencies.containsKey(key)) {
            unresolvedDependencies.put(key, new DefaultUnresolvedDependencyResult(requested, constraint, reason, from, failure));
        }

	{"// +build x y \n ", nil, "not a build constraint"},
	{"// +build x y \nmore", nil, "not a build constraint"},
	{" //+build x y", nil, "not a build constraint"},

	{"//go:build x && y", and(tag("x"), tag("y")), ""},
	{"//go:build x && y\n", and(tag("x"), tag("y")), ""},
	{"//go:build x && y\n ", nil, "not a build constraint"},
	{"//go:build x && y\nmore", nil, "not a build constraint"},

    @Nonnull
    VersionRange parseVersionRange(@Nonnull String range);

    /**
     * Parses the specified version constraint specification, for example "1.0" or "[1.0,2.0)".
     *
     * @param constraint the constraint specification to parse, must not be {@code null}
     * @return the parsed version constraint, never {@code null}
     * @throws VersionParserException if the range specification violates the syntax rules of this scheme
     */

     *
     * <p>
     * Note that no classifier or extension is accepted here.
     * </p>
     *
     * @param dependencyConstraintNotation the dependency constraint notation
     * @return the new dependency constraint
     * @since 8.7
     */
    DependencyConstraint create(CharSequence dependencyConstraintNotation);

    /**
     * Create a {@link DependencyConstraint} from a series of strings.

    }

    def "doesn't create a copy of an already immutable version constraint"() {
        given:
        def v = new DefaultImmutableVersionConstraint('1.0')

        when:
        def c = DefaultImmutableVersionConstraint.of(v)

        then:
        v.is(c)
    }

    def "can convert mutable version constraint to immutable version constraint"() {
        given:

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package p

type _[a, b] /* ERROR "missing type constraint" */ struct{}
type _[a t, b t, c]  /* ERROR "missing type constraint" */ struct{}
type _ struct {
	t [n]byte
	t[a]
	t[a,]
	t[a, b]
	t[a, b,]
}
type _ struct {
	t [n, /* ERROR "unexpected comma; expecting ]" */ ]byte
}

                }
                edge("org:foo:{strictly 1.1}", "org:foo:1.1")
                constraint("org:foo:1.0", "org:foo:1.1")
            }
        }

        where:
        unique << [true, false]
    }

    def 'does not fail when lock file conflicts with declared version constraint (initial unique: #unique)'() {
        given:
        mavenRepo.module('org', 'foo', '1.0').publish()

        this.reason = reason;
        this.selected = selected;
        this.failure = failure;
        this.constraint = constraint;
        this.fromVariant = fromVariant;
        this.targetVariant = targetVariant;
    }

    @Override
    public ComponentSelector getRequested() {
        return requested;
    }

    @Override
    public Long getSelected() {
        return selected;
    }

    @Override

// is deterministic.
func StructuralTerms(tparam *types.TypeParam) ([]*types.Term, error) {
	constraint := tparam.Constraint()
	if constraint == nil {
		return nil, fmt.Errorf("%s has nil constraint", tparam)
	}
	iface, _ := constraint.Underlying().(*types.Interface)
	if iface == nil {
		return nil, fmt.Errorf("constraint is %T, not *types.Interface", constraint.Underlying())
	}
	return InterfaceTermSet(iface)
}

}

// CHECK-LABEL: func @failed_to_propagate_constraints
func.func @failed_to_propagate_constraints(%arg0 : tensor<?x?xf32>)
    -> (tensor<?x?xf32> { tf.constraint = "value"  }) {
  // expected-error@below {{failed to propagate results constraints: 0:value}}
  %0 = "test.OpC"(%arg0) : (tensor<?x?xf32>) -> tensor<?x?xf32>
  // expected-remark@below {{operand #0 constrained to: value}}
  func.return %0 : tensor<?x?xf32>