Kernel.sigil_C
You're seeing just the macro
sigil_C
, go back to Kernel module for more information.
Handles the sigil ~C
for charlists.
It returns a charlist without interpolations and without escape characters, except for the escaping of the closing sigil character itself.
Examples
iex> ~C(foo)
'foo'
iex> ~C(f#{o}o)
'f\#{o}o'