<===> empty/input.scss
a {b: str-length("")}

<===> empty/output.css
a {
  b: 0;
}

<===>
================================================================================
<===> one_character/input.scss
a {b: str-length("c")}

<===> one_character/output.css
a {
  b: 1;
}

<===>
================================================================================
<===> multiple_characters/input.scss
a {b: str-length("fblthp abatement")}

<===> multiple_characters/output.css
a {
  b: 16;
}

<===>
================================================================================
<===> double_width_character/input.scss
// Sass treats strings as sequences of Unicode codepoint; it doesn't care if a
// character is represented as two UTF-16 code units.
a {b: str-length("👭")}

<===> double_width_character/output.css
a {
  b: 1;
}

<===>
================================================================================
<===> combining_character/input.scss
// Sass does *not* treat strings as sequences of glyphs, so this string which
// contains "c" followed by a combining umlaut should be considered two separate
// characters even though it's rendered as only one.
a {b: str-length("c\0308")}

<===> combining_character/output.css
a {
  b: 2;
}

<===>
================================================================================
<===> unquoted/input.scss
a {b: str-length(loofamonster)}

<===> unquoted/output.css
a {
  b: 12;
}

<===>
================================================================================
<===> named/input.scss
a {b: str-length($string: "c")}

<===> named/output.css
a {
  b: 1;
}

<===>
================================================================================
<===> error/type/input.scss
a {b: str-length(1)}

<===> error/type/error
Error: $string: 1 is not a string.
  ,
1 | a {b: str-length(1)}
  |       ^^^^^^^^^^^^^
  '
  input.scss 1:7  root stylesheet

<===> error/type/error-libsass
Error: argument `$string` of `str-length($string)` must be a string
        on line 1:7 of input.scss, in function `str-length`
        from line 1:7 of input.scss
>> a {b: str-length(1)}

   ------^

<===>
================================================================================
<===> error/too_few_args/input.scss
a {b: str-length()}

<===> error/too_few_args/error
Error: Missing argument $string.
  ,--> input.scss
1 | a {b: str-length()}
  |       ^^^^^^^^^^^^ invocation
  '
  ,--> sass:string
1 | @function length($string) {
  |           =============== declaration
  '
  input.scss 1:7  root stylesheet

<===> error/too_few_args/error-libsass
Error: Function str-length is missing argument $string.
        on line 1 of input.scss
>> a {b: str-length()}

   ------^

<===>
================================================================================
<===> error/too_many_args/input.scss
a {b: str-length(c, d)}

<===> error/too_many_args/error
Error: Only 1 argument allowed, but 2 were passed.
  ,--> input.scss
1 | a {b: str-length(c, d)}
  |       ^^^^^^^^^^^^^^^^ invocation
  '
  ,--> sass:string
1 | @function length($string) {
  |           =============== declaration
  '
  input.scss 1:7  root stylesheet

<===> error/too_many_args/error-libsass
Error: wrong number of arguments (2 for 1) for `str-length'
        on line 1:7 of input.scss
>> a {b: str-length(c, d)}

   ------^