Available since LÖVE 0.9.0
It has been renamed from PixelEffect:getWarnings.
Returns any warning and error messages from compiling the shader code. This can be used for debugging your shaders if there's anything the graphics hardware doesn't like.
warnings = Shader:getWarnings( )
None.
string warnings
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Licensed under the GNU Free Documentation License, Version 1.3.
https://love2d.org/wiki/Shader:getWarnings