fix(selfhost-sema): allow func-typed assignment via tekFunc refType comparison

src/hir_lower.bux

@@ -1788,6 +1788,15 @@ module HirLower {
 
         // Unary
         if kind == ekUnary {
+            // `&NamedFunc` — the ident already lowers to the fat-pointer value
+            // (BuxFn_* struct init via __adapt_); taking its address would yield
+            // a pointer-to-struct where the struct value is expected.
+            if expr.intValue == tkAmp && expr.child1 != null as *Expr && expr.child1.kind == ekIdent {
+                let ampSym: Symbol = Scope_Lookup(ctx.scope, expr.child1.strValue);
+                if ampSym.kind == skFunc {
+                    return Lcx_LowerExpr(ctx, expr.child1);
+                }
+            }
             // Overflow checking: in @[Checked] mode, lower negation on signed integers to checked call
             if ctx.checkedFunc && !ctx.releaseFunc && expr.intValue == tkMinus {
                 var isSignedInt: bool = false;

src/sema.bux

@@ -232,6 +232,9 @@ module Sema {
             }
             return true;
         }
+        // Func-typed values: `&Func` reports tyPointer as its kind while its
+        // refType is tekFunc — accept when both sides are func-typed.
+        if toTe.kind == tekFunc && fromTe != null as *TypeExpr && fromTe.kind == tekFunc { return true; }
         if fromKind == toKind { return true; }
         if Sema_IsStrictNumeric(fromKind) && Sema_IsStrictNumeric(toKind) { return true; }
         if Sema_IsBool(fromKind) && Sema_IsBool(toKind) { return true; }