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In OpenGL ES 2.0 / GLSL, where do you need precision specifiers?
gl_FragColor = lowp vec4(1);

lowp float floaty = 1. * 2.;
floaty = lowp 1. * lowp 2.;

dot(gl_LightSource[0].position.xyz, gl_NormalMatrix * gl_Normal)

lowp dot(lowp gl_LightSource[0].position.xyz, lowp gl_NormalMatrix * lowp gl_Normal)

precision highp float;

precision highp float;
precision highp int;
precision lowp sampler2D;
precision lowp samplerCube;

precision mediump int;
precision lowp sampler2D;
precision lowp samplerCube;