Try/catch in update assignment

[odnoletkov]

Describe the bug

try/catch produce unexpected results when used in the rhs of the update assignment |=

To Reproduce

$ jq -n '1 | . |= 2' # OK
2

$ jq -n '1 | . |= try 2' # BUG, expected: 2 
null

$ jq -n '1 | . |= try 2 catch 3' # BUG, expected: 2
3

$ jq -n '1 | . |= try 2 catch .' # BUG, expected: 2
{
  "__jq": 0
}

$ jq -n '["1", "2a", "3", 4] | .[] |= try tonumber' # BUG, expected: [1, null, 3, 4]
[
  "2a",
  4
]

Plain assignment = and surprisingly even arithmetic update-assignments such as += work as expected:

$ jq -n '1 | . = try 2' # OK
2

$ jq -n '1 | . += try 2' # OK
3

Throwing the error also works as expected

$ jq -n '1 | . |= try error("err")' # OK
null

$ jq -n '1 | . |= try error("err") catch 2' # OK
2

Environment

% jq --version; uname; sw_vers -productVersion
jq-1.6
Darwin
10.15.7

$ jq --version; uname
jq-1.6
Linux

[itchyny]

Maybe related issue: #1859, #2140.

[odnoletkov]

@itchyny thanks for the pointers, just checked master at a17dd32: turns out e74eab8 fixed both catch cases above:

$ jq -n '1 | . |= try 2 catch 3' # OK
2

$ jq -n '1 | . |= try 2 catch .' # OK
2

But try without catch is still broken:

$ jq -n '1 | . |= try 2' # BUG, expected: 2 
null

$ jq -n '["1", "2a", "3", 4] | .[] |= try tonumber' # BUG, expected: [1, null, 3, 4]
[
  "2a",
  4
]

@wtlangford thanks for the fix! Do you think e74eab8 should have fixed the case w/o catch as well or is this a separate issue?

Closing this as a duplicate of #2140