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The rust compiler is permissive of f32 and f64 suffix #922

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The rust compiler is permissive of f32 and f64 suffix #922

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The rust compiler is permissive of f32 and f64 suffix on integer lite…
philberty Jan 8, 2021
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Update src/tokens.md
philberty Jan 8, 2021
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6 changes: 5 additions & 1 deletion src/tokens.md
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Expand Up @@ -349,6 +349,7 @@ literal_. The grammar for recognizing the two kinds of literals is mixed.
> INTEGER_SUFFIX :\
>       `u8` | `u16` | `u32` | `u64` | `u128` | `usize`\
>    | `i8` | `i16` | `i32` | `i64` | `i128` | `isize`
>    | `f32` | `f64`

An _integer literal_ has one of four forms:

Expand All @@ -368,7 +369,10 @@ Like any literal, an integer literal may be followed (immediately,
without any spaces) by an _integer suffix_, which forcibly sets the
type of the literal. The integer suffix must be the name of one of the
integral types: `u8`, `i8`, `u16`, `i16`, `u32`, `i32`, `u64`, `i64`,
`u128`, `i128`, `usize`, or `isize`.
`u128`, `i128`, `f32`,`f64`, `usize`, or `isize`.

Note the suffix of `f32` and `f64` ensures that the literal has a floating point type.
Even when it would otherwise be lexed as an integer.

The type of an _unsuffixed_ integer literal is determined by type inference:

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