From c09d5f585a1298f591e9096eaa8f760a7a3b8e5d Mon Sep 17 00:00:00 2001
From: Ed Cragg <ed.cragg@eipi.xyz>
Date: Sun, 5 Dec 2021 13:55:53 +0000
Subject: [PATCH] Get a hashmap, odd borrowing

   Compiling aoc0521 v0.1.0 (/home/ed/git/aoc-2021/05)
warning: cannot borrow `points` as mutable because it is also borrowed as immutable
  --> src/main.rs:85:32
   |
84 |             match points.get(&point) {
   |                   ------ immutable borrow occurs here
85 |                 Some(count) => points.insert(point, count+1),
   |                                ^^^^^^               ----- immutable borrow later used here
   |                                |
   |                                mutable borrow occurs here
   |
   = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
   = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
   = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>

warning: `aoc0521` (bin "aoc0521") generated 1 warning
    Finished dev [unoptimized + debuginfo] target(s) in 1.19s
     Running `target/debug/aoc0521`
[
    Line {
        start: Point {
            x: 0,
            y: 9,
        },
        end: Point {
            x: 5,
            y: 9,
        },
    },
    Line {
        start: Point {
            x: 8,
            y: 0,
        },
        end: Point {
            x: 0,
            y: 8,
        },
    },
    Line {
        start: Point {
            x: 9,
            y: 4,
        },
        end: Point {
            x: 3,
            y: 4,
        },
    },
    Line {
        start: Point {
            x: 2,
            y: 2,
        },
        end: Point {
            x: 2,
            y: 1,
        },
    },
    Line {
        start: Point {
            x: 7,
            y: 0,
        },
        end: Point {
            x: 7,
            y: 4,
        },
    },
    Line {
        start: Point {
            x: 6,
            y: 4,
        },
        end: Point {
            x: 2,
            y: 0,
        },
    },
    Line {
        start: Point {
            x: 0,
            y: 9,
        },
        end: Point {
            x: 2,
            y: 9,
        },
    },
    Line {
        start: Point {
            x: 3,
            y: 4,
        },
        end: Point {
            x: 1,
            y: 4,
        },
    },
    Line {
        start: Point {
            x: 0,
            y: 0,
        },
        end: Point {
            x: 8,
            y: 8,
        },
    },
    Line {
        start: Point {
            x: 5,
            y: 5,
        },
        end: Point {
            x: 8,
            y: 2,
        },
    },
]
Line { start: Point { x: 0, y: 9 }, end: Point { x: 5, y: 9 } }
dx=5 dy=0
n=5 ix=1 iy=0
Line { start: Point { x: 8, y: 0 }, end: Point { x: 0, y: 8 } }
dx=-8 dy=8
n=8 ix=1 iy=-1
Line { start: Point { x: 9, y: 4 }, end: Point { x: 3, y: 4 } }
dx=-6 dy=0
n=6 ix=1 iy=0
Line { start: Point { x: 2, y: 2 }, end: Point { x: 2, y: 1 } }
dx=0 dy=-1
n=1 ix=0 iy=1
Line { start: Point { x: 7, y: 0 }, end: Point { x: 7, y: 4 } }
dx=0 dy=4
n=4 ix=0 iy=1
Line { start: Point { x: 6, y: 4 }, end: Point { x: 2, y: 0 } }
dx=-4 dy=-4
n=4 ix=1 iy=1
Line { start: Point { x: 0, y: 9 }, end: Point { x: 2, y: 9 } }
dx=2 dy=0
n=2 ix=1 iy=0
Line { start: Point { x: 3, y: 4 }, end: Point { x: 1, y: 4 } }
dx=-2 dy=0
n=2 ix=1 iy=0
Line { start: Point { x: 0, y: 0 }, end: Point { x: 8, y: 8 } }
dx=8 dy=8
n=8 ix=1 iy=1
Line { start: Point { x: 5, y: 5 }, end: Point { x: 8, y: 2 } }
dx=3 dy=-3
n=3 ix=1 iy=-1
{Point { x: 8, y: 0 }: 1, Point { x: 8, y: 8 }: 1, Point { x: 6, y: 6 }: 1, Point { x: 10, y: 4 }: 1, Point { x: 7, y: 2 }: 1, Point { x: 2, y: 3 }: 1, Point { x: 4, y: 4 }: 2, Point { x: 11, y: 4 }: 1, Point { x: 7, y: 0 }: 1, Point { x: 7, y: 5 }: 1, Point { x: 12, y: -4 }: 1, Point { x: 3, y: 4 }: 1, Point { x: 7, y: 7 }: 1, Point { x: 10, y: -2 }: 1, Point { x: 1, y: 1 }: 1, Point { x: 8, y: 2 }: 1, Point { x: 11, y: -3 }: 1, Point { x: 2, y: 2 }: 2, Point { x: 7, y: 1 }: 1, Point { x: 7, y: 3 }: 2, Point { x: 6, y: 4 }: 2, Point { x: 9, y: 7 }: 1, Point { x: 13, y: 4 }: 1, Point { x: 3, y: 3 }: 1, Point { x: 15, y: -7 }: 1, Point { x: 2, y: 9 }: 2, Point { x: 10, y: 8 }: 1, Point { x: 3, y: 9 }: 1, Point { x: 9, y: -1 }: 1, Point { x: 13, y: -5 }: 1, Point { x: 5, y: 9 }: 1, Point { x: 5, y: 4 }: 1, Point { x: 4, y: 9 }: 1, Point { x: 16, y: -8 }: 1, Point { x: 9, y: 4 }: 1, Point { x: 12, y: 4 }: 1, Point { x: 0, y: 9 }: 2, Point { x: 14, y: -6 }: 1, Point { x: 15, y: 4 }: 1, Point { x: 8, y: 6 }: 1, Point { x: 5, y: 5 }: 2, Point { x: 7, y: 4 }: 1, Point { x: 1, y: 9 }: 2, Point { x: 14, y: 4 }: 1, Point { x: 0, y: 0 }: 1}
---
 05/src/main.rs | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/05/src/main.rs b/05/src/main.rs
index 4f613e1..b298ff5 100644
--- a/05/src/main.rs
+++ b/05/src/main.rs
@@ -67,7 +67,7 @@ fn main() {
 }
 
 fn run(i: &str) {
-    let points: HashMap<Point, usize> = HashMap::new();
+    let mut points: HashMap<Point, usize> = HashMap::new();
 
     let lines: Vec<Line> = i
         .lines()
@@ -78,15 +78,15 @@ fn run(i: &str) {
 
     for line in lines {
         println!("{:?}", line);
-        println!("{:?}", line.cast());
-
-        line
-            .cast()
-            .for_each(|point| {
-                match points.get(point) {
-                    Some(count) => points.insert(*point, count+1),
-                    None => points.insert(*point, 1),
-                };
-            });
+        //println!("{:?}", line.cast());
+
+        for point in line.cast() {
+            match points.get(&point) {
+                Some(count) => points.insert(point, count+1),
+                None => points.insert(point, 1),
+            };
+        };
     }
+
+    println!("{:?}", points);
 }