Add new test case which breaks with this code

Author: jakebailey

tests/baselines/reference/declarationEmitTypeParameterNameShadowedInternally.js

@@ -0,0 +1,22 @@
+//// [tests/cases/compiler/declarationEmitTypeParameterNameShadowedInternally.ts] ////
+
+//// [declarationEmitTypeParameterNameShadowedInternally.ts]
+export const foo = <T,>(x: T) => {
+	const inner = <T,>(y: T) => [x, y] as const;
+	return inner;
+}
+
+
+//// [declarationEmitTypeParameterNameShadowedInternally.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.foo = void 0;
+var foo = function (x) {
+    var inner = function (y) { return [x, y]; };
+    return inner;
+};
+exports.foo = foo;
+
+
+//// [declarationEmitTypeParameterNameShadowedInternally.d.ts]
+export declare const foo: <T>(x: T) => <T_1>(y: T_1) => readonly [T, T_1];

tests/baselines/reference/declarationEmitTypeParameterNameShadowedInternally.symbols

@@ -0,0 +1,22 @@
+//// [tests/cases/compiler/declarationEmitTypeParameterNameShadowedInternally.ts] ////
+
+=== declarationEmitTypeParameterNameShadowedInternally.ts ===
+export const foo = <T,>(x: T) => {
+>foo : Symbol(foo, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 0, 12))
+>T : Symbol(T, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 0, 20))
+>x : Symbol(x, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 0, 24))
+>T : Symbol(T, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 0, 20))
+
+	const inner = <T,>(y: T) => [x, y] as const;
+>inner : Symbol(inner, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 1, 6))
+>T : Symbol(T, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 1, 16))
+>y : Symbol(y, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 1, 20))
+>T : Symbol(T, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 1, 16))
+>x : Symbol(x, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 0, 24))
+>y : Symbol(y, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 1, 20))
+>const : Symbol(const)
+
+	return inner;
+>inner : Symbol(inner, Decl(declarationEmitTypeParameterNameShadowedInternally.ts, 1, 6))
+}
+

tests/baselines/reference/declarationEmitTypeParameterNameShadowedInternally.types

@@ -0,0 +1,21 @@
+//// [tests/cases/compiler/declarationEmitTypeParameterNameShadowedInternally.ts] ////
+
+=== declarationEmitTypeParameterNameShadowedInternally.ts ===
+export const foo = <T,>(x: T) => {
+>foo : <T>(x: T) => <T_1>(y: T_1) => readonly [T, T_1]
+><T,>(x: T) => {	const inner = <T,>(y: T) => [x, y] as const;	return inner;} : <T>(x: T) => <T_1>(y: T_1) => readonly [T, T_1]
+>x : T
+
+	const inner = <T,>(y: T) => [x, y] as const;
+>inner : <T_1>(y: T_1) => readonly [T, T_1]
+><T,>(y: T) => [x, y] as const : <T_1>(y: T_1) => readonly [T, T_1]
+>y : T
+>[x, y] as const : readonly [T_1, T]
+>[x, y] : readonly [T_1, T]
+>x : T_1
+>y : T
+
+	return inner;
+>inner : <T_1>(y: T_1) => readonly [T, T_1]
+}
+

tests/cases/compiler/declarationEmitTypeParameterNameShadowedInternally.ts

@@ -0,0 +1,7 @@
+// @declaration: true
+// @skipLibCheck: false
+
+export const foo = <T,>(x: T) => {
+	const inner = <T,>(y: T) => [x, y] as const;
+	return inner;
+}