Delete is_ascii function from stdlib/ascii.jou (#1268)

Author: Akuli

stdlib/ascii.jou

@@ -2,14 +2,6 @@ import "stdlib/str.jou"
 import "stdlib/mem.jou"
 import "stdlib/list.jou"
 
-# Test if a string is ASCII only.
-@public
-def is_ascii(s: byte*) -> bool:
-    for p = s; *p != '\0'; p++:
-        if *p >= 128:
-            return False
-    return True
-
 # Check for '0', '1', ..., '9'.
 @public
 def is_ascii_digit(b: byte) -> bool:

tests/should_succeed/ascii_test.jou

@@ -6,11 +6,6 @@ import "stdlib/str.jou"
 import "stdlib/list.jou"
 
 def main() -> int:
-    assert is_ascii("hello")
-    assert is_ascii("hello world test!!! @$!")
-    assert is_ascii("")
-    assert not is_ascii("örkkimörkki")
-
     assert is_ascii_digit('0')
     assert is_ascii_digit('7')
     assert is_ascii_digit('9')