dmd.builtin
    Implement CTFE for intrinsic (builtin) functions.
  
Discussion
    Currently includes functions from std.math, core.math and core.bitop.
  
License
Source: builtin.d
Documentation: https://dlang.org/phobos/dmd_builtin.html
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  DeclarationBUILTINisBuiltin(FuncDeclarationfd);Determine if function is a builtin one that we can evaluate at compile time. 
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  DeclarationExpressioneval_builtin(const ref Locloc, FuncDeclarationfd, Expressions*arguments);Evaluate builtin function. Return result; NULL if cannot evaluate it.