Missing object_usage_linter due to line break

[bersbersbers]

foo <- function() {
    unknown_function(1)

    unknown_function(
        1
    )

    unknown_function(1)
}

I get this in VS Code, while in my opinion, the middle call should also be detected.

[infotroph]

A variant of this that bit me today: multiline conditionals.

foo <- function() {

    # warns
    if (unknown_function()) NULL 

    # does not warn
    if (unknown_function()) {
    	NULL
    }

}

[AshesITR]

Thanks for reporting.
The issue is in parse_check_usage when multiline warnings are issued:

foo <- function() {

    # warns
    if (unknown_function()) NULL 

    # does not warn
    if (unknown_function()) {
        NULL
    }

}

codetools::checkUsage(foo)
#> <anonymous>: no visible global function definition for 'unknown_function' (<text>:4)
#> <anonymous>: no visible global function definition for 'unknown_function' (<text>:7-9)
lintr:::parse_check_usage(foo)
#>                                                        message             name
#> 1 no visible global function definition for 'unknown_function' unknown_function
#> 2                                                         <NA>             <NA>
#>     path line_number
#> 1 <text>           4
#> 2   <NA>        <NA>

^{Created on 2021-02-15 by the reprex package (v1.0.0)}