parse_format optimize import use

Author: hkBst

compiler/rustc_parse_format/src/lib.rs

@@ -16,8 +16,6 @@
 #![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
-use std::{iter, str, string};
-
 pub use Alignment::*;
 pub use Count::*;
 pub use Piece::*;
@@ -205,11 +203,11 @@ pub enum Count<'a> {
 }
 
 pub struct ParseError {
-    pub description: string::String,
-    pub note: Option<string::String>,
-    pub label: string::String,
+    pub description: String,
+    pub note: Option<String>,
+    pub label: String,
     pub span: InnerSpan,
-    pub secondary_label: Option<(string::String, InnerSpan)>,
+    pub secondary_label: Option<(String, InnerSpan)>,
     pub suggestion: Suggestion,
 }
 
@@ -225,7 +223,7 @@ pub enum Suggestion {
     /// `format!("{foo:?#}")` -> `format!("{foo:#?}")`
     /// `format!("{foo:?x}")` -> `format!("{foo:x?}")`
     /// `format!("{foo:?X}")` -> `format!("{foo:X?}")`
-    ReorderFormatParameter(InnerSpan, string::String),
+    ReorderFormatParameter(InnerSpan, String),
 }
 
 /// The parser structure for interpreting the input format string. This is
@@ -237,7 +235,7 @@ pub enum Suggestion {
 pub struct Parser<'a> {
     mode: ParseMode,
     input: &'a str,
-    cur: iter::Peekable<str::CharIndices<'a>>,
+    cur: std::iter::Peekable<std::str::CharIndices<'a>>,
     /// Error messages accumulated during parsing
     pub errors: Vec<ParseError>,
     /// Current position of implicit positional argument pointer
@@ -336,7 +334,7 @@ impl<'a> Parser<'a> {
     pub fn new(
         s: &'a str,
         style: Option<usize>,
-        snippet: Option<string::String>,
+        snippet: Option<String>,
         append_newline: bool,
         mode: ParseMode,
     ) -> Parser<'a> {
@@ -366,7 +364,7 @@ impl<'a> Parser<'a> {
     /// Notifies of an error. The message doesn't actually need to be of type
     /// String, but I think it does when this eventually uses conditions so it
     /// might as well start using it now.
-    fn err<S1: Into<string::String>, S2: Into<string::String>>(
+    fn err<S1: Into<String>, S2: Into<String>>(
         &mut self,
         description: S1,
         label: S2,
@@ -385,11 +383,7 @@ impl<'a> Parser<'a> {
     /// Notifies of an error. The message doesn't actually need to be of type
     /// String, but I think it does when this eventually uses conditions so it
     /// might as well start using it now.
-    fn err_with_note<
-        S1: Into<string::String>,
-        S2: Into<string::String>,
-        S3: Into<string::String>,
-    >(
+    fn err_with_note<S1: Into<String>, S2: Into<String>, S3: Into<String>>(
         &mut self,
         description: S1,
         label: S2,
@@ -974,7 +968,7 @@ impl<'a> Parser<'a> {
 /// in order to properly synthesise the intra-string `Span`s for error diagnostics.
 fn find_width_map_from_snippet(
     input: &str,
-    snippet: Option<string::String>,
+    snippet: Option<String>,
     str_style: Option<usize>,
 ) -> InputStringKind {
     let snippet = match snippet {
@@ -1089,8 +1083,8 @@ fn find_width_map_from_snippet(
     InputStringKind::Literal { width_mappings }
 }
 
-fn unescape_string(string: &str) -> Option<string::String> {
-    let mut buf = string::String::new();
+fn unescape_string(string: &str) -> Option<String> {
+    let mut buf = String::new();
     let mut ok = true;
     unescape::unescape_unicode(string, unescape::Mode::Str, &mut |_, unescaped_char| {
         match unescaped_char {