skia2/resources/sksl/runtime_errors/IllegalShaderUse.rte

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// Expect >= 7 errors (currently 9, due to double-reporting)
// Correct declaration (used in some test functions)
uniform shader s1;
uniform shader s2;
// Incorrect shader declarations (they must be uniform)
shader s3;
in shader s4;
// Various places that shaders should not be allowed:
half4 local() { shader s; return sample(s); }
half4 parameter(shader s) { return sample(s); }
shader returned() { return s1; }
half4 constructed() { return sample(shader(s1)); }
half4 expression(bool b) { return sample(b ? s1 : s2); }