messing around with borrowing and mutability

src/main.rs

@@ -1,13 +1,13 @@
-#[derive(Debug)]
-struct Point(i32, i32);
-
-fn add(p1: &Point, p2: &Point) -> Point {
-    return Point(p1.0 + p2.0, p1.1 + p2.1);
-}
-
 fn main() {
-    let p1 = Point(3, 4);
-    let p2 = Point(10, 20);
-    let p3 = add(&p1, &p2);
-    println!("{p1:?} + {p2:?} = {p3:?}");
+    let mut a: i32 = 10;
+    let mut b: &mut i32 = &mut a;
+
+    {
+        let c: &mut i32 = &mut b;
+        *c = 20;
+        println!("c: {c}");
+    }
+
+    println!("a: {a}");
+    //println!("b: {b}");
 }

target/.rustc_info.json

@@ -1 +1 @@
-{"rustc_fingerprint":16320356917333427825,"outputs":{"4614504638168534921":{"success":true,"status":"","code":0,"stdout":"rustc 1.66.1 (90743e729 2023-01-10)\nbinary: rustc\ncommit-hash: 90743e7298aca107ddaa0c202a4d3604e29bfeb6\ncommit-date: 2023-01-10\nhost: x86_64-unknown-linux-gnu\nrelease: 1.66.1\nLLVM version: 15.0.2\n","stderr":""},"10376369925670944939":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/vbatts/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"15697416045686424142":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n","stderr":""}},"successes":{}}
+{"rustc_fingerprint":16320356917333427825,"outputs":{"4614504638168534921":{"success":true,"status":"","code":0,"stdout":"rustc 1.66.1 (90743e729 2023-01-10)\nbinary: rustc\ncommit-hash: 90743e7298aca107ddaa0c202a4d3604e29bfeb6\ncommit-date: 2023-01-10\nhost: x86_64-unknown-linux-gnu\nrelease: 1.66.1\nLLVM version: 15.0.2\n","stderr":""},"15697416045686424142":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n","stderr":""},"10376369925670944939":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/vbatts/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""}},"successes":{}}

target/debug/.fingerprint/basics00-2aafd7e9003de7a7/bin-basics00.json

@@ -0,0 +1 @@
+{"rustc":7419878829587384386,"features":"[]","target":14602933489408981941,"profile":7309141686862299243,"path":1684066648322511884,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/basics00-2aafd7e9003de7a7/dep-bin-basics00"}}],"rustflags":[],"metadata":7797948686568424061,"config":2202906307356721367,"compile_kind":0}

target/debug/.fingerprint/basics00-2aafd7e9003de7a7/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

target/debug/.fingerprint/basics00-3922c6fa78ff0509/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

target/debug/.fingerprint/basics00-3922c6fa78ff0509/test-bin-basics00.json

@@ -0,0 +1 @@
+{"rustc":7419878829587384386,"features":"[]","target":14602933489408981941,"profile":1021633075455700787,"path":1684066648322511884,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/basics00-3922c6fa78ff0509/dep-test-bin-basics00"}}],"rustflags":[],"metadata":7797948686568424061,"config":2202906307356721367,"compile_kind":0}

target/debug/deps/basics00-2aafd7e9003de7a7.d

@@ -0,0 +1,5 @@
+/home/vbatts/tmp.rust/basics00/target/debug/deps/basics00-2aafd7e9003de7a7.rmeta: src/main.rs
+
+/home/vbatts/tmp.rust/basics00/target/debug/deps/basics00-2aafd7e9003de7a7.d: src/main.rs
+
+src/main.rs:

target/debug/deps/basics00-3922c6fa78ff0509.d

@@ -0,0 +1,5 @@
+/home/vbatts/tmp.rust/basics00/target/debug/deps/basics00-3922c6fa78ff0509.rmeta: src/main.rs
+
+/home/vbatts/tmp.rust/basics00/target/debug/deps/basics00-3922c6fa78ff0509.d: src/main.rs
+
+src/main.rs: