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The `warn()` function outputs the given values to stderr.
Returns the amount of bytes written.
-- Testcase --
{%
let n = 0;
n += warn(null, "\n");
n += warn(true, "\n");
n += warn(false, "\n");
n += warn(123, "\n");
n += warn(456.789, "\n");
n += warn(NaN, "\n");
n += warn(Infinity, "\n");
n += warn("Hello world", "\n");
n += warn([ 1, 2, 3 ], "\n");
n += warn({ some: "dict" }, "\n");
n += warn(warn, "\n");
warn(n, " bytes written\n");
%}
-- End --
-- Expect stderr --
true
false
123
456.789
NaN
Infinity
Hello world
[ 1, 2, 3 ]
{ "some": "dict" }
function warn(...) { [native code] }
117 bytes written
-- End --
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