// [config]
// expect_result: fail
// glsl_version: 1.20
// glsles_version: 1.00
// [end config]
//
// From section 4.3.4 of the GLSL 1.20 spec:
// Attribute variables are read-only as far as the vertex shader is
// concerned.
attribute float x;
float f() {
x = 0.0;
return x;
}