Masking Specular with textures

Unity Engine
1

I’m learning the book of.
There’s one example the code as:

Shader "Example/Masking Specular" {
	Properties {
		_MainTint("Diffuse Tint",Color)=(1,1,1,1)
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_SpecuColor("Specular Color",Color)=(1,1,1,1)
        _SpecPower("Specular Power",Range(0,30))=1
        _SpecularMask("Specular Texture",2D)="white"{}
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		#pragma surface surf Phong

		
		sampler2D _SpecularMask;
        sampler2D _MainTex;
        float4  _MainTint; 
        float4  _SpecuColor;
        float _SpecPower;
        
        struct SurfaceCustomOutput{
			fixed3 Albedo;
	    	fixed3 Normal;
	    	fixed3 Emission;
	   	    fixed3 Specularcolor;
	   	    half Specular;
	    	fixed Gloss;
	   		fixed Alpha;
		}

		 inline fixed4 LightingPhong(SurfaceCustomOutput s, fixed3 lightDir,half3 viewDir, fixed atten)
		 {
		 float diff = dot(s.Normal,lightDir);
		 float3 reflectionVector = normalize(2.0*s.Normal*diff-lightDir);
	     
	     float spec = pow(max(0,dot(reflectionVector,viewDir)),_SpecPower)*s.Specular;
	     float3 finalSpec = s.Specularcolor.rgb*spec*s.Specularcolor;
	     
	     fixed4 c;
	     c.rgb =(s.Albedo*_LightColor0.rgb*diff)+(_LightColor0.rgb*finalSpec);
	     c.a =s.Alpha;
	     return c;
		
		}
		
		
		
		struct Input {
			float2 uv_MainTex;
			float2 uv_SpecularMask;
		};

		
		
		void surf (Input IN, inout SurfaceCustomOutput o) 
		{
			half4 c = tex2D (_MainTex, IN.uv_MainTex)*_MainTint;
			half4 specMask = tex2D(_SpecularMask, IN.uv_SpecularMask)*_SpecuColor;
			o.Albedo =c.rgb;
			o.Specular = specMask.r;
			o.Specularcolor = specMask.rgb;
			o.Alpha = c.a;
		}
		
		
		
		ENDCG
	} 
	FallBack "Diffuse"

but there’s always warning of syntax error on line 33 and 44.so,do any one understanding why?

2

o,I see ,just have to add a ’ ;’ after the struct SurfaceCustomOutput{}