/sys$common/syshlp/HELPLIB.HLB  —  CRTL  tgamma  Return Values
    n                  Upon success, the gamma function of x.
    -1                 If x is negative. errno is set to EDOM.
    HUGE_VAL           Overflow occurred, or x is 0. errno is set to
                       ERANGE.
    NaN                If x is NaN or -Inf. errno is set to EDOM.
    x                  If x is +Inf.
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