Report is mostly done now, fine tuning left

tex/code/compiler-help

@@ -0,0 +1,12 @@
+error[E0412]: cannot find type `Json` in this scope
+ --> src/component/login.rs:6:16
+  |
+6 | fn create() -> Json {}
+  |                ^^^^ not found in this scope
+  |
+    help: possible candidates are found in other modules, you can import them into scope
+  |
+1 | use yew::format::Json;
+  |
+1 | use yew::format::json::Json;
+  |

tex/code/trait.rs

@@ -0,0 +1,34 @@
+trait Muoto {
+    fn pinta_ala(&self) -> u32;
+}
+
+struct Suorakulmio {
+    x: u32,
+    y: u32,
+}
+
+struct Ympyra {
+    r: f64,
+}
+
+impl Muoto for Suorakulmio {
+    fn pinta_ala(&self) -> u32 {
+        self.x * self.y
+    }
+}
+
+impl Muoto for Ympyra {
+    fn pinta_ala(&self) -> u32 {
+        (3.141 * self.r * self.r) as u32
+    }
+}
+
+fn main() {
+    let muoto1 = Suorakulmio { x: 15, y: 10 };
+    let muoto2 = Ympyra { r: 8.5 };
+    println!("Suorakulmion pinta-ala: {}", muoto1.pinta_ala());
+    println!("Ympyrän pinta-ala: {}", muoto2.pinta_ala());
+}
+
+// Suorakulmion pinta-ala: 150
+// Ympyrän pinta-ala: 226