add tree rewriter

src/front/check2.ts

@@ -136,7 +136,36 @@ class TypeChecker {
                     }
                 }
 
-                throw new Error("not implemented");
+                const expectedInner = expected.is("Any")
+                    ? expected
+                    : expected.as("Array").kind.ty;
+
+                let res = this.resolve(
+                    this.expr(k.values[0], expectedInner),
+                    expected,
+                    k.values[0].loc,
+                );
+                while (true) {
+                    for (const val of k.values.slice(1)) {
+                        res = this.resolve(
+                            this.expr(val, expectedInner),
+                            expected,
+                            k.values[0].loc,
+                        );
+                        if (res.rewriteSubtree) {
+                            break;
+                        }
+                    }
+                    if (!res.rewriteSubtree) {
+                        break;
+                    }
+
+                    for (const val of k.values) {
+                        this.rewriteTree(val, res.ty);
+                    }
+                }
+
+                return res.ty;
             }
             case "IndexExpr": {
                 throw new Error("not implemented");
@@ -187,6 +216,14 @@ class TypeChecker {
         }
         throw new Error("not implemented");
     }
+
+    private rewriteTree(node: ast.Node, ty: Ty) {
+        const k = node.kind;
+        switch (k.tag) {
+            default:
+                throw new Error("not implemented");
+        }
+    }
 }
 
 type TyRes = {

src/stringify.ts

@@ -69,8 +69,6 @@ export function tyPretty(ty: ty.Ty, colors = noColors): string {
             return `<error>`;
         case "Void":
             return `${c.typeIdent}void`;
-        case "IntLiteral":
-            return `${c.typeIdent}{integer}`;
         case "Int":
             return `${c.typeIdent}${ty.kind.intTy}`;
         case "Bool":
@@ -103,6 +101,8 @@ export function tyPretty(ty: ty.Ty, colors = noColors): string {
                         `${c.punctuation}, `,
                     )
             }${c.punctuation}) -> ${ty.kind.ty.kind.retTy.pretty(c)}`;
+        case "AnyInt":
+            return `${c.typeIdent}{integer}`;
     }
     return "<unhandled>";
 }