lnav/test/datafile_simple.7

             func(arg1="a", arg2="b")
 key   5:5       ^                     
 key   5:9        ^--^                 arg1
quot  11:12             ^              a
 val  11:12             ^              a
pair   5:12       ^-----^              arg1="a
 key  15:19                 ^--^       arg2
quot  21:22                       ^    b
 val  21:22                       ^    b
pair  15:22                 ^-----^    arg2="b
 grp   5:22       ^---------------^    arg1="a", arg2="b
pair   5:22       ^---------------^    arg1="a", arg2="b
msg         :func(arg1="a", arg2="b")
format      :func(#)
{
    "arg1": "a",
    "arg2": "b"
}