Fix compiler bug; Rewrite CI workflow

.github/workflows/rust.yml

@@ -1,21 +1,19 @@
-name: Dust Tests
+name: Cargo Build & Test
 
 on:
   push:
-    branches: ["main"]
   pull_request:
-    branches: ["main"]
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
+  build_and_test:
+    name: Dust Build & Test
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
-      - name: Build
+      - run: rustup update nightly && rustup default nightly
-        run: cargo build --verbose
+      - run: cargo build --verbose
-      - name: Run tests
+      - run: cargo test --verbose --no-fail-fast
-        run: cargo test --verbose

dust-lang/src/compiler/mod.rs

@@ -1116,12 +1116,20 @@ impl<'src> Compiler<'src> {
         self.emit_instruction(test, Type::None, operator_position);
         self.emit_instruction(jump, Type::None, operator_position);
 
+        let instruction_count_before_right = self.instructions.len();
+
         self.advance()?;
         self.parse_sub_expression(&rule.precedence)?;
 
         // TODO: Check if the right type is boolean
 
-        if matches!(
+        if self.instructions.len() == instruction_count_before_right + 1 {
+            self.instructions
+                .last_mut()
+                .unwrap()
+                .0
+                .set_a_field(left.index());
+        } else if matches!(
             self.get_last_operations(),
             Some([
                 Operation::EQUAL | Operation::LESS | Operation::LESS_EQUAL,