How's locate custom material expression HLSL error code?

Development Rendering
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1

Error code:
[SM5] Material.usf(1282,48-52)

“1282,48-52” ? what’s mean? Error code line number?

2

In material editor go to Window->HLSL code-> Copy. Then paste it to a text editor of your choice and go to specified line numbers.

3

Thx, the 1282 is line number, but what’s “48-52” mean?
Can u give me more detail about “1282,48-52”.

4

That is line number too.