--- subscripting
integer:     e
real:        e
past end:    error{ errortext = "Subscript out of range" }
--- slicing
from, len:   ell
find:        w
find, len:   wor
not found:   <uninitialized object>
real length: ell
start zero:  error{ errortext = "Subscript out of range" }
start past:  error{ errortext = "Subscript out of range" }
--- assigning through a slice
replaced:    howdy world
by find:     howdy there
out of rng:  error{ errortext = "Subscript out of range" }
--- method parameters
length:      error{ errortext = "string.length() doesn't take parameters." }
find none:   error{ errortext = "string.find(Search, [Start]) takes at least one parameter" }
find three:  error{ errortext = "string.find(Search, [Start]) takes only two parameters" }
find type:   error{ errortext = "string.find(Search, [Start]): Search must be a string or regex" }
split none:  error{ errortext = "string.split(Separator[, Max_Split]) takes at least one parameter" }
split three: error{ errortext = "string.split(Separator[, Max_Split]) takes at most two parameters" }
split type:  error{ errortext = "string.split(Separator[, Max_Split]): Separator must be a RegExp or string" }
upper:       error{ errortext = "string.upper() doesn't take parameters." }
lower:       error{ errortext = "string.lower() doesn't take parameters." }
format none: error{ errortext = "string.format() requires a parameter." }
join none:   error{ errortext = "string.join(array) requires a parameter." }
join type:   error{ errortext = "string.join expects an array" }
unknown mth: <uninitialized object>
--- format tags
no index:    <idx required before: 'prop'>
with index:  5
padded:      7
unclosed:    {
missing arg: 7<invalid index: #2>
join holes:  x