compiling to metal fails for some shaders

[romamik]

For example, this shader cannot be compiled to MSL:

#version 450

in vec3 vertexPosition;
in vec4 vertexColor;
uniform mat4 projectionMatrix;
out vec4 fragmentColor;

void main() {
	gl_Position = projectionMatrix * vec4(vertexPosition, 1.0);
	fragmentColor = vertexColor;
}

Looks like matrix by vector multiplication is what triggers the problem.