Conflict between function and template with the same name

[Uranuz via Digitalmars-d-learn]

I have a question about this example code;

import std.stdio;

string getByName(string name)
{
	return "smth";
}

template getByName(string name)
{
	enum
	//string
	getByName = getByName(name);
}


void main()
{
	writeln(getByName!("name"));
}

This produces compilation output:
/d967/f983.d(13): Error: forward reference of variable getByName
/d967/f983.d(19): Error: template instance f983.getByName!"name" 
error instantiating

Uncommenting line *//string* changes message to:

Compilation output:
/d976/f558.d(13): Error: recursive evaluation of getByName(name)
/d976/f558.d(19): Error: template instance f558.getByName!"name" 
error instantiating

Is there any reason why function and template conflict. They 
using different syntax to *call*. For template we have *!* but 
for function we don't have it. So why compiler is not able to see 
the difference?