Normalize passes keep spans and clean warnings

src/runner/json_v0_bridge/lowering/expr.rs

@@ -3,6 +3,7 @@ use super::merge::new_block;
 use super::ternary;
 use super::BridgeEnv;
 use crate::mir::{BasicBlockId, ConstValue, EffectMask, MirFunction, MirInstruction, ValueId};
+use crate::ast::Span;
 use std::collections::BTreeMap;
 
 use super::super::ast::ExprV0;
@@ -290,7 +291,13 @@ pub(super) fn lower_expr_with_scope<S: VarScope>(
             } else {
                 inputs.push((fall_bb, rval));
             }
-            crate::mir::ssot::cf_common::insert_phi_at_head(f, merge_bb, out, inputs);
+            crate::mir::ssot::cf_common::insert_phi_at_head_spanned(
+                f,
+                merge_bb,
+                out,
+                inputs,
+                Span::unknown(),
+            );
             Ok((out, merge_bb))
         }
         ExprV0::Call { name, args } => {