It's not that the compiler doesn't find setShaderParam, it's that it expects a 
Variant!

This is what I get: 
    
    
    Error: type mismatch: got <ShaderMaterial, string, ImageTexture>
    but expected one of:
    proc setShaderParam(self: ShaderMaterial; param: string; value: Variant)
      first type mismatch at position: 3
      required type: Variant
      but expression 'texture' is of type: ImageTexture
    proc setShaderParam(self: ShaderMaterial; param: string; value: Variant)
      first type mismatch at position: 1
      required type: ShaderMaterial
      but expression 'mat' is of type: ShaderMaterial
    
    
    Run

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