[Query] Inspect Exceptions of Functions

Generated from 'wiki-query.ts' on 2026-11-08, 09:20:49 UTC (v2.17.4), do not edit directly.

Determine whether functions throw exceptions (known to flowR)
This query is requested with the type inspect-exception.
Run in the REPL: :query @inspect-exception [(<crit>;...)] <code | file://path>

With this query you can identify which functions in the code throw exceptions (known to flowR).

Using the following example code:

mayFail <- function(x) {
  if(x < 0) stop("Negative value!")
  else sqrt(x)
}
safeFail <- function(x) {
  tryCatch(
    mayFail(x),
    error = function(e) { NA }
  )
}

the following query returns the information for all identified function definitions whether they throw exceptions:

[ { "type": "inspect-exception" } ]

(This can be shortened to @inspect-exception when used with the REPL command :query).

Results (prettified and summarized):

Query: inspect-exception
  - Function 20 (1.12-4.1) throws exceptions:
      - Exception maybe thrown at id 11 "stop" (2.13-35, cds: true:2.3-3.14)
  - Function 40 (8.13-30) does not throw exceptions.
  - Function 44 (5.13-10.1) does not throw exceptions.

{"inspect-exception":{".meta":{},"exceptions":{"20":[{"id":11,"cds":[{"id":18,"when":true}]}],"40":[],"44":[]}},".meta":{}}

mayFail <- function(x) {
  if(x < 0) stop("Negative value!")
  else sqrt(x)
}
safeFail <- function(x) {
  tryCatch(
    mayFail(x),
    error = function(e) { NA }
  )
}