Scope

• This squid is an SOSML squid. (It occurs independently of the frontend used. Example: Wrong code elaborating.)
• This squid is an SOSML-frontend squid. (It occurs on sosml.org, but not when using SOSML directly. Example: Getting unexpected evaluation time-outs.)
• I don't know. (Don't worry, we'll figure things out.)
• Other. (Please specify.)

Describe the bug
The trunc function, which is a standard function in the SML Basis Library, is not recognized by the SOSML interpreter. Attempting to use trunc(real) results in an "Unbound value identifier 'trunc'" error, indicating that the function is not in scope or not available.

To Reproduce

(* Expected output: val it = 5 : int *)
trunc(5.4);