Triggers an error.
Triggers an error when an assertion fails.
Triggers an error with a "not yet implemented" message.
Prints its arguments, formatted for debugging.
Captures errors with a brief error message.
Captures errors with a verbose error message.
Returns a string describing the current file and line number.
Returns a string describing the current call-stack.
#t if all of its arguments are equal to one another.
#t if all of its arguments share the same identity.
#t if its first argument is numerically equal to any other argument.
#t if its first argument is equal to any other argument.
#t if its first argument has the same identity as any other argument.
Returns a shallow copy of its argument.
Returns a deep, recursive copy of its argument.
Freezes a collection so that it can no longer be mutated.
Recursively freezes a tree of collections.
Generates a high-precision timestamp.
Sleeps the current thread for the given number of seconds.
Returns the number of seconds elapsed since the UNIX epoch, as a string.