public B source(String filename, int line, int column) {
        return source(new SourceLocation(filename, line, column));
    }
Sets the source location of the shape.

@param filename Name of the file in which the shape was defined.
@param line Line number in the file where the shape was defined.
@param column Column number of the line where the shape was defined.
@return Returns the builder.
smithy-model/src/main/java/software/amazon/smithy/model/shapes/AbstractShapeBuilder.java