As stored in file loaded, with tabs:

CREATE OR REPLACE FUNCTION tcl_module_version(text) RETURNS text
	AS $_$
	set funcname $1
	append funcname "Version"
	elog DEBUG "Calling TCL function $funcname"
	return [$funcname]
$_$
	LANGUAGE pltcl;

As stored in database, tabs replaced with \x09:

       Name        | Source code
-------------------+-------------------------------------------
tcl_module_version | \r
                   : \x09set funcname $1\r
                   : \x09append funcname "Version"\r
                   : \x09elog DEBUG "Calling TCL function $funcname"\r
                   : \x09return [$funcname]\r
                   :
(1 row)