GLES CTS test case:
checks if GLSL compiler can parse macro "#line" successfully, following is the shader code:
precision mediump float;
attribute highp vec4 dEQP_Position;
varying float out0;
out0 = float(__LINE__);
gl_Position = dEQP_Position;
yyerror() will be called while parsing #line which casue the case fails
I don't have links to details handy, but sometime between September 20-22, 2017 Khronos voted to make #line expression behavior undefined (including failure to parse), with the intention of making it explicitly an error in future GLSL versions.
This test is invalid and should be removed from dEQP. We will not accept patches to implement this behavior in Mesa.
Historically, some people shipped a hack to make this invalid test pass:
The right thing to do now is delete the test.
As Kenneth said, Khronos voted to consider #line with an expression as undefined behaviour, and thus these tests were removed