diff --git a/base/src/main/java/org/aya/tyck/tycker/StateBased.java b/base/src/main/java/org/aya/tyck/tycker/StateBased.java
index 466cee6d..23c1fe00 100644
--- a/base/src/main/java/org/aya/tyck/tycker/StateBased.java
+++ b/base/src/main/java/org/aya/tyck/tycker/StateBased.java
@@ -37,7 +37,7 @@ public sealed interface StateBased permits AbstractExprTycker {
   default <D extends TeleDef, S extends TeleDecl<? extends Term>> @NotNull Result
   defCall(DefVar<D, S> defVar, Callable.Factory<D, S> function) {
     var tele = TeleDef.defTele(defVar);
-    var spine = tele.mapIndexed((i, type) -> type.<Term>map(_ -> new LocalTerm(tele.size() - 1 - i)));    // λ. λ. λ. someCtor 2 1 0
+    var spine = tele.mapIndexed((i, type) -> type.<Term>map(x -> new LocalTerm(tele.size() - 1 - i)));    // λ. λ. λ. someCtor 2 1 0
     Term body = function.make(defVar, 0, spine);
     var type = PiTerm.make(tele, TeleDef.defResult(defVar));
     if ((defVar.core instanceof FnDef fn && fn.modifiers.contains(Modifier.Inline)) /*|| defVar.core instanceof PrimDef*/) {
diff --git a/base/src/test/java/org/aya/syntax/core/BindTest.java b/base/src/test/java/org/aya/syntax/core/BindTest.java
index 22f0b00a..da094580 100644
--- a/base/src/test/java/org/aya/syntax/core/BindTest.java
+++ b/base/src/test/java/org/aya/syntax/core/BindTest.java
@@ -29,19 +29,4 @@ public class BindTest {
     var expect = new LamTerm(true, new LamTerm(true, new AppTerm(new LocalTerm(1), Arg.ofExplicitly(new LocalTerm(0)))));
     assertEquals(expect, lamXYXY);
   }
-
-
-  @Test
-  public void tyckLam() {
-    var x = new LocalVar("x", SourcePos.NONE);
-    var y = new LocalVar("y", SourcePos.NONE);
-    // x y
-    var body = new Expr.App(new WithPos<>(SourcePos.NONE, new Expr.Ref(x)), new Expr.NamedArg(SourcePos.NONE, true, null, new WithPos<>(SourcePos.NONE, new Expr.Ref(y))));
-    // λ y. x y
-    var lamYXY = new Expr.Lambda(new Expr.Param(SourcePos.NONE, y, true), new WithPos<>(SourcePos.NONE, body));
-    var lamXYXY = new Expr.Lambda(new Expr.Param(SourcePos.NONE, x, true), new WithPos<>(SourcePos.NONE, lamYXY));
-    var tycker = new ExprTycker(null, new LocalCtx(MutableMap.create(), null), null);
-    var result = tycker.synthesize(lamXYXY);
-    return;
-  }
 }