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Auto merge of #23167 - rprichard:fix-plugin-rustbook, r=steveklabnik

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* "let mut text" was previously of &String type.  Now it is of &str type.

 * Update the slicing syntax.  Both &text[] and text.slice_from() evaluate
   to a &str.

 * We were passing a u32 to expr_usize.  Call expr_u32 instead.

r? @steveklabnik
Fixes #23166
This commit is contained in:
bors 2015-03-08 12:10:42 +00:00
commit ead9ab84b8
1 changed files with 4 additions and 4 deletions
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8
src/doc/trpl/plugins.md
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@ -63,7 +63,7 @@ that implements Roman numeral integer literals.
```ignore
#![crate_type="dylib"]
#![feature(plugin_registrar)]
#![feature(plugin_registrar, rustc_private)]
extern crate syntax;
extern crate rustc;
@ -92,13 +92,13 @@ fn expand_rn(cx: &mut ExtCtxt, sp: Span, args: &[TokenTree])
}
};
let mut text = &text;
let mut text = &*text;
let mut total = 0;
while !text.is_empty() {
match NUMERALS.iter().find(|&&(rn, _)| text.starts_with(rn)) {
Some(&(rn, val)) => {
total += val;
text = text.slice_from(rn.len());
text = &text[rn.len()..];
}
None => {
cx.span_err(sp, "invalid Roman numeral");
@ -107,7 +107,7 @@ fn expand_rn(cx: &mut ExtCtxt, sp: Span, args: &[TokenTree])
}
}
MacEager::expr(cx.expr_usize(sp, total))
MacEager::expr(cx.expr_u32(sp, total))
}
#[plugin_registrar]