Printexc.Slot(3) OCaml library Printexc.Slot(3)

# [NAME](#NAME)

Printexc.Slot - no description

# [Module](#Module)

Module Printexc.Slot

# [Documentation](#Documentation)

Module **Slot**  
: **sig end**

**Since** 4.02

*type t* = **Printexc.backtrace\_slot**

*val is\_raise* : **t -> bool**

**is\_raise slot** is **true** when **slot** refers to a raising point in the code, and **false** when it comes from a simple function call.

**Since** 4.02

*val is\_inline* : **t -> bool**

**is\_inline slot** is **true** when **slot** refers to a call that got inlined by the compiler, and **false** when it comes from any other context.

**Since** 4.04

*val location* : **t -> Printexc.location option**

**location slot** returns the location information of the slot, if available, and **None** otherwise.

Some possible reasons for failing to return a location are as follow:

-the slot corresponds to a compiler-inserted raise

-the slot corresponds to a part of the program that has not been compiled with debug information ( **-g** )

**Since** 4.02

*val name* : **t -> string option**

**name slot** returns the name of the function or definition enclosing the location referred to by the slot.

**name slot** returns None if the name is unavailable, which may happen for the same reasons as **location** returning None.

**Since** 4.11

*val format* : **int -> t -> string option**

**format pos slot** returns the string representation of **slot** as **raw\_backtrace\_to\_string** would format it, assuming it is the **pos** -th element of the backtrace: the **0** -th element is pretty-printed differently than the others.

Whole-backtrace printing functions also skip some uninformative slots; in that case, **format pos slot** returns **None** .

**Since** 4.02

2026-09-04 OCamldoc

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Document: Printexc.Slot(3o) from ocaml 5.5.1-r0 (Chainguard OS)
Source: https://github.com/ocaml/ocaml