Don't crash on placejolder bytecode

RustPython · youknowone · Jan 9, 2026 · Jan 5, 2026 · Jan 6, 2026 · Jan 6, 2026
commit 8e1433cf986c6bcc50470e3f589b488306ebc40d
diff --git a/crates/compiler-core/src/bytecode.rs b/crates/compiler-core/src/bytecode.rs
@@ -1909,7 +1909,7 @@ impl Instruction {
             UnaryNegative => 0,
             UnaryNot => 0,
             GetYieldFromIter => 0,
-            _ => unreachable!("Tried to get stack effect of a placeholder instruction ({self:?}"),
+            _ => 0,
         }
     }