    const std = @import("../std.zig");
    const math = std.math;
    const expect = std.testing.expect;
    const maxInt = std.math.maxInt;

    /// Returns whether x is a nan.
    pub fn isNan(x: anytype) bool {
        return x != x;
    }

    /// Returns whether x is a signalling nan.
    pub fn isSignalNan(x: anytype) bool {
        // Note: A signalling nan is identical to a standard nan right now but may have a different bit

        // representation in the future when required.

        return isNan(x);
    }

    test "math.isNan" {
        try expect(isNan(math.nan(f16)));
        try expect(isNan(math.nan(f32)));
        try expect(isNan(math.nan(f64)));
        try expect(isNan(math.nan(f128)));
        try expect(!isNan(@as(f16, 1.0)));
        try expect(!isNan(@as(f32, 1.0)));
        try expect(!isNan(@as(f64, 1.0)));
        try expect(!isNan(@as(f128, 1.0)));
    }