diff options
Diffstat (limited to 'library/core/src/fmt/mod.rs')
| -rw-r--r-- | library/core/src/fmt/mod.rs | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/library/core/src/fmt/mod.rs b/library/core/src/fmt/mod.rs index c9821bf81..fcda097f0 100644 --- a/library/core/src/fmt/mod.rs +++ b/library/core/src/fmt/mod.rs @@ -267,7 +267,7 @@ extern "C" { /// family of functions. It contains a function to format the given value. At /// compile time it is ensured that the function and the value have the correct /// types, and then this struct is used to canonicalize arguments to one type. -#[cfg_attr(not(bootstrap), lang = "format_argument")] +#[lang = "format_argument"] #[derive(Copy, Clone)] #[allow(missing_debug_implementations)] #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")] @@ -280,7 +280,7 @@ pub struct ArgumentV1<'a> { /// This struct represents the unsafety of constructing an `Arguments`. /// It exists, rather than an unsafe function, in order to simplify the expansion /// of `format_args!(..)` and reduce the scope of the `unsafe` block. -#[cfg_attr(not(bootstrap), lang = "format_unsafe_arg")] +#[lang = "format_unsafe_arg"] #[allow(missing_debug_implementations)] #[doc(hidden)] #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")] @@ -392,8 +392,31 @@ enum FlagV1 { } impl<'a> Arguments<'a> { + #[doc(hidden)] + #[inline] + #[unstable(feature = "fmt_internals", issue = "none")] + #[rustc_const_unstable(feature = "const_fmt_arguments_new", issue = "none")] + pub const fn new_const(pieces: &'a [&'static str]) -> Self { + if pieces.len() > 1 { + panic!("invalid args"); + } + Arguments { pieces, fmt: None, args: &[] } + } + /// When using the format_args!() macro, this function is used to generate the /// Arguments structure. + #[cfg(not(bootstrap))] + #[doc(hidden)] + #[inline] + #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")] + pub fn new_v1(pieces: &'a [&'static str], args: &'a [ArgumentV1<'a>]) -> Arguments<'a> { + if pieces.len() < args.len() || pieces.len() > args.len() + 1 { + panic!("invalid args"); + } + Arguments { pieces, fmt: None, args } + } + + #[cfg(bootstrap)] #[doc(hidden)] #[inline] #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")] @@ -417,8 +440,7 @@ impl<'a> Arguments<'a> { #[doc(hidden)] #[inline] #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")] - #[rustc_const_unstable(feature = "const_fmt_arguments_new", issue = "none")] - pub const fn new_v1_formatted( + pub fn new_v1_formatted( pieces: &'a [&'static str], args: &'a [ArgumentV1<'a>], fmt: &'a [rt::v1::Argument], @@ -475,7 +497,7 @@ impl<'a> Arguments<'a> { /// ``` /// /// [`format()`]: ../../std/fmt/fn.format.html -#[cfg_attr(not(bootstrap), lang = "format_arguments")] +#[lang = "format_arguments"] #[stable(feature = "rust1", since = "1.0.0")] #[derive(Copy, Clone)] pub struct Arguments<'a> { |