Change parse_lines and parse_all to require 1 item by default

Author: ictrobot

crates/utils/src/parser/base.rs

@@ -426,7 +426,7 @@ pub trait Parser<'i>: Sized {
     #[inline]
     fn parse_all(&self, input: &'i str) -> Result<Vec<Self::Output>, InputError> {
         ParserRef(self)
-            .repeat(Constant(()), 0)
+            .repeat(Constant(()), 1)
             .parse_complete(input)
     }
 
@@ -451,10 +451,7 @@ pub trait Parser<'i>: Sized {
     /// ```
     #[inline]
     fn parse_lines(&self, input: &'i str) -> Result<Vec<Self::Output>, InputError> {
-        ParserRef(self)
-            .with_suffix(Eol())
-            .repeat(Constant(()), 0)
-            .parse_complete(input)
+        ParserRef(self).repeat(Eol(), 1).parse_complete(input)
     }
 
     /// Create an iterator which applies this parser repeatedly until the provided input is fully

crates/year2015/src/day06.rs

@@ -138,7 +138,7 @@ examples!(Day06 -> (u32, u32) [
     },
     {
         input: "turn on 0,0 through 0,0\n\
-            toggle 0,0 through 999,999\n",
+            toggle 0,0 through 999,999",
         part2: 2000001,
     },
 ]);

crates/year2016/src/day20.rs

@@ -17,7 +17,8 @@ impl Day20 {
                     Err("end value cannot be less than start")
                 }
             })
-            .parse_lines(input)?;
+            .repeat(parser::eol(), 0)
+            .parse_complete(input)?;
         ranges.sort_unstable();
         Ok(Self { ranges })
     }

crates/year2018/src/day06.rs

@@ -16,9 +16,7 @@ impl Day06 {
             .repeat_n(", ")
             .map(Vec2::from)
             .parse_lines(input)?;
-        if locations.is_empty() {
-            return Err(InputError::new(input, 0, "expected at least one location"));
-        }
+
         if locations.len() >= u8::MAX as usize {
             return Err(InputError::new(input, 0, "too many locations"));
         }

crates/year2018/src/day17.rs

@@ -34,10 +34,6 @@ impl Day17 {
             })
             .parse_lines(input)?;
 
-        if segments.is_empty() {
-            return Err(InputError::new(input, 0, "expected at least one line"));
-        }
-
         let (mut x_min, mut x_max, mut y_min, mut y_max) = (500, 500, usize::MAX, 0);
         for &(axis, c1, c2, c3) in &segments {
             if axis == b'x' {