core: remove the dead function fmt::argumentstr.

src/libcore/fmt/mod.rs

@@ -543,14 +543,6 @@ pub fn argument<'a, T>(f: extern "Rust" fn(&T, &mut Formatter) -> Result,
     }
 }
 
-/// When the compiler determines that the type of an argument *must* be a string
-/// (such as for select), then it invokes this method.
-#[doc(hidden)] #[inline]
-#[experimental = "implementation detail of the `format_args!` macro"]
-pub fn argumentstr<'a>(s: &'a &str) -> Argument<'a> {
-    argument(Show::fmt, s)
-}
-
 /// When the compiler determines that the type of an argument *must* be a uint
 /// (such as for plural), then it invokes this method.
 #[doc(hidden)] #[inline]

src/libstd/fmt.rs

@@ -418,7 +418,7 @@ pub use core::fmt::Error;
 pub use core::fmt::{Argument, Arguments, write, radix, Radix, RadixFmt};
 
 #[doc(hidden)]
-pub use core::fmt::{argument, argumentstr, argumentuint};
+pub use core::fmt::{argument, argumentuint};
 
 /// The format function takes a precompiled format string and a list of
 /// arguments, to return the resulting formatted string.