[FIX] fixing dbe

src/Optimizations/Passes/DeadBlockElimination.rs

@@ -37,9 +37,9 @@ impl Pass for DeadBlockElimination {
         for block in func.blocks.clone() {
             if !used_blocks.contains(&block.name) && index != 0 { // do not remove first block
                 func.blocks.remove(index);
+            } else { // no removed block
+                index += 1;
             }
-
-            index += 1;
         }
     }
 }

tests/bugs/dbe_block_remove_index.yl

@@ -0,0 +1,29 @@
+# RUN:
+cargo run -p ylc -- -in=%s -passes=dbe -fmt
+# IN:
+
+define i32 @main() {
+  entry:
+    br ret
+
+  ret:
+    br after_should_be_removed
+
+  should_be_removed:
+    ret i32 1
+
+  after_should_be_removed:
+    ret i32 12345
+}
+
+# STDOUT:
+define i32 @main() {
+  entry:
+    br ret
+
+  ret:
+    br after_should_be_removed
+
+  after_should_be_removed:
+    ret i32 12345
+}