Document parse-base()

Added to Rakudo in
rakudo/rakudo@b1cbb8b

doc/Type/Str.pod6

@@ -168,6 +168,23 @@ Examples:
 
 TODO
 
+=head2 routine parse-base
+
+    multi sub    parse-base(Str:D $num, Int:D $radix) returns Numeric
+    multi method parse-base(Str:D $num: Int:D $radix) returns Numeric
+
+Performs the reverse of L«C<Numeric>|/routine/base» by converts a string
+with a base-C<$radix> number to its base-10 L«C<Numeric>|/type/Numeric»
+equivalent. Will L«C<fail>|/routine/fail» if radix is not in range C<2..36>
+or of the string being parsed contains characters that are not valid
+for the specified base.
+
+    1337.base(32).parse-base(32).say; # 1337
+    'Perl6'.parse-base(30).say;       # 20652936
+    'FF.DD'.parse-base(16).say;       # 255.863281    
+
+See also: L«:16<FF> syntax for number literals|/syntax/Number%20literals»
+
 =head2 routine split
 
 =for code :skip-test