Add deprecation notices for the original declarations

Author: wooster0

lib/std/ascii.zig

@@ -10,6 +10,25 @@ const std = @import("std");
 const mem = std.mem;
 const testing = std.testing;
 
+// TODO: remove these after the release of 0.10.0
+const isAlNum = @compileError("deprecated: use isAlphanumeric");
+const eqlIgnoreCase = @compileError("deprecated: use eqlInsensitive");
+const isPrint = @compileError("deprecated: use isPrintable");
+const startsWithIgnoreCase = @compileError("deprecated: use startsWithInsensitive");
+const lessThanIgnoreCase = @compileError("deprecated: use lessThanInsensitive");
+const orderIgnoreCase = @compileError("deprecated: use orderInsensitive");
+const indexOfIgnoreCase = @compileError("deprecated: use indexOfInsensitive");
+const indexOfIgnoreCasePos = @compileError("deprecated: use indexOfInsensitivePos");
+const endsWithIgnoreCase = @compileError("deprecated: use endsWithInsensitive");
+const control_code = @compileError("deprecated: use control");
+const isBlank = @compileError("deprecated: use `char == ' ' or char == '\t'`");
+const isXDigit = @compileError("deprecated: use isHexadecimal");
+const isCntrl = @compileError("deprecated: use isControl");
+const isAlpha = @compileError("deprecated: use isAlphabetic");
+const isSpace = @compileError("deprecated: use isWhitespace");
+const spaces = @compileError("deprecated: use whitespace");
+const isPunct = @compileError("deprecated: write your own function suited to your particular case");
+
 /// Contains constants for the C0 control codes of the ASCII encoding.
 ///
 /// See also: https://en.wikipedia.org/wiki/C0_and_C1_control_codes and `is_control`