Stereo Single Pass Screen Fading Shader

VR_ScreenFader.shader

Shader "Custom/ScreenFader"
{
	Properties
	{
		_MainTex("Texture", 2D) = "white" {}
		_FadeColor ("Color", Color) = (0,0,0,0)
		_Intensity ("Intensity", float) = 0
	}

	SubShader
	{
		Cull Off ZWrite Off ZTest Always

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
				UNITY_VERTEX_OUTPUT_STEREO
			};

			v2f vert (appdata v)
			{
				v2f o;
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = v.uv;
				return o;
			}
			
			UNITY_DECLARE_SCREENSPACE_TEXTURE(_MainTex);
			half4 _FadeColor;
			half _Intensity;

			fixed4 frag(v2f i) : SV_Target
			{
			    	UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
				fixed4 color = UNITY_SAMPLE_SCREENSPACE_TEXTURE(_MainTex, i.uv);
				fixed4 lerpedColor = lerp(color.rgba, _FadeColor.rgba, _Intensity);
				return lerpedColor;
			}
			ENDCG
		}
	}
}

Unrecognised Identifier AppToVertex
Cannot resolve symbol

You need to replace line 35 with
v2f vert (appdata v)

@aeldron thank you!