415     fn from_isize(n: isize) -> Option<Self> {  in from_isize()
422     fn from_i8(n: i8) -> Option<Self> {  in from_i8()
429     fn from_i16(n: i16) -> Option<Self> {  in from_i16()
436     fn from_i32(n: i32) -> Option<Self> {  in from_i32()
442     fn from_i64(n: i64) -> Option<Self>;  in from_i64()
453     fn from_i128(n: i128) -> Option<Self> {  in from_i128()
460     fn from_usize(n: usize) -> Option<Self> {  in from_usize()
467     fn from_u8(n: u8) -> Option<Self> {  in from_u8()
474     fn from_u16(n: u16) -> Option<Self> {  in from_u16()
481     fn from_u32(n: u32) -> Option<Self> {  in from_u32()
487     fn from_u64(n: u64) -> Option<Self>;  in from_u64()
498     fn from_u128(n: u128) -> Option<Self> {  in from_u128()
505     fn from_f32(n: f32) -> Option<Self> {  in from_f32()
516     fn from_f64(n: f64) -> Option<Self> {  in from_f64()
704     fn from<T: ToPrimitive>(n: T) -> Option<Self>;  in from()
739     fn from<U: ToPrimitive>(n: U) -> Option<Self> {  in from()