Graphmath.Mat33.make_rotate

You're seeing just the function make_rotate, go back to Graphmath.Mat33 module for more information.
Link to this function

make_rotate(theta)

Specs

make_rotate(float()) :: mat33()

make_rotate( theta ) creates a mat33 that rotates a vec2 by theta radians about the +Z axis.

theta is the float of the number of radians of rotation the matrix will provide.

This returns a mat33 which rotates by theta radians about the +Z axis.