Remove a last println and use a static default parser

Heap profilers are fun

build_pycompat.py

@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 from dateutil.parser import parse
 from dateutil.tz import tzutc
 from datetime import datetime
@@ -232,7 +233,7 @@ fn parse_and_assert(
     tzinfos: &HashMap<String, i32>,
 ) {
 
-    let mut parser = Parser::new(info);
+    let parser = Parser::new(info);
     let rs_parsed = parser.parse(
         s,
         dayfirst,
@@ -282,7 +283,7 @@ fn parse_fuzzy_and_assert(
     tzinfos: &HashMap<String, i32>,
 ) {
 
-    let mut parser = Parser::new(info);
+    let parser = Parser::new(info);
     let rs_parsed = parser.parse(
         s,
         dayfirst,

build_pycompat_tokenizer.py

@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 from dateutil.parser import _timelex
 
 from build_pycompat import tests

src/lib.rs

@@ -108,6 +108,7 @@ lazy_static! {
     static ref ONE: Decimal = Decimal::new(1, 0);
     static ref TWENTY_FOUR: Decimal = Decimal::new(24, 0);
     static ref SIXTY: Decimal = Decimal::new(60, 0);
+    static ref DEFAULT_PARSER: Parser = Parser::default();
 }
 
 impl From<DecimalError> for ParseError {
@@ -670,7 +671,7 @@ impl Parser {
     /// order to be resolved.
     #[cfg_attr(feature = "cargo-clippy", allow(too_many_arguments))] // Need to release a 2.0 for changing public API
     pub fn parse(
-        &mut self,
+        &self,
         timestr: &str,
         dayfirst: Option<bool>,
         yearfirst: Option<bool>,
@@ -699,7 +700,7 @@ impl Parser {
 
     #[cfg_attr(feature = "cargo-clippy", allow(cyclomatic_complexity))] // Imitating Python API is priority
     fn parse_with_tokens(
-        &mut self,
+        &self,
         timestr: &str,
         dayfirst: Option<bool>,
         yearfirst: Option<bool>,
@@ -953,7 +954,6 @@ impl Parser {
     ) -> ParseResult<Option<FixedOffset>> {
         // TODO: Actual timezone support
         if let Some(offset) = res.tzoffset {
-            println!("offset={}", offset);
             Ok(Some(FixedOffset::east(offset)))
         } else if res.tzoffset == None
             && (res.tzname == Some(" ".to_owned()) || res.tzname == Some(".".to_owned())
@@ -1283,7 +1283,7 @@ fn ljust(s: &str, chars: usize, replace: char) -> String {
 /// The default implementation assumes English values for names of months,
 /// days of the week, etc. It is equivalent to Python's `dateutil.parser.parse()`
 pub fn parse(timestr: &str) -> ParseResult<(NaiveDateTime, Option<FixedOffset>)> {
-    let res = Parser::default().parse(
+    let res = DEFAULT_PARSER.parse(
         timestr,
         None,
         None,

src/tests/fuzzing.rs

@@ -16,7 +16,7 @@ fn test_fuzz() {
     // OverflowError: Python int too large to convert to C long
     // assert_eq!(parse("8888884444444888444444444881"), Err(ParseError::AmPmWithoutHour));
     let default = NaiveDate::from_ymd(2016, 6, 29).and_hms(0, 0, 0);
-    let mut p = Parser::default();
+    let p = Parser::default();
     let res = p.parse("\x0D\x31", None, None, false, false, Some(&default), false, &HashMap::new()).unwrap();
     assert_eq!(res.0, default);
 

src/tests/pycompat_parser.rs

@@ -39,7 +39,7 @@ fn parse_and_assert(
     tzinfos: &HashMap<String, i32>,
 ) {
 
-    let mut parser = Parser::new(info);
+    let parser = Parser::new(info);
     let rs_parsed = parser.parse(
         s,
         dayfirst,
@@ -89,7 +89,7 @@ fn parse_fuzzy_and_assert(
     tzinfos: &HashMap<String, i32>,
 ) {
 
-    let mut parser = Parser::new(info);
+    let parser = Parser::new(info);
     let rs_parsed = parser.parse(
         s,
         dayfirst,