multiple errors for the same problem

[db48x]

I've defined more than one impl for an interface, and they are all in scope at the moment. Here are the errors I get:

src/libcore/str.rs:695:4: 695:13 error: mismatched types: expected `u8` but found `char` (types differ)
src/libcore/str.rs:695     iter::all(s, { |c| r += escape_char(c); true });
                           ^~~~~~~~~
src/libcore/str.rs:695:4: 695:13 error: multiple applicable implementations in scope
src/libcore/str.rs:695     iter::all(s, { |c| r += escape_char(c); true });
                           ^~~~~~~~~
src/libcore/str.rs:695:4: 695:13 error: multiple applicable implementations in scope
src/libcore/str.rs:695     iter::all(s, { |c| r += escape_char(c); true });
                           ^~~~~~~~~
src/libcore/str.rs:695:4: 695:13 error: multiple applicable implementations in scope
src/libcore/str.rs:695     iter::all(s, { |c| r += escape_char(c); true });
                           ^~~~~~~~~
src/libcore/str.rs:1020:8: 1020:17 error: mismatched types: expected `u8` but found `char` (types differ)
src/libcore/str.rs:1020     ret iter::all(s, char::is_whitespace);
                                ^~~~~~~~~
src/libcore/str.rs:1020:8: 1020:17 error: multiple applicable implementations in scope
src/libcore/str.rs:1020     ret iter::all(s, char::is_whitespace);
                                ^~~~~~~~~
src/libcore/str.rs:1020:8: 1020:17 error: multiple applicable implementations in scope
src/libcore/str.rs:1020     ret iter::all(s, char::is_whitespace);
                                ^~~~~~~~~
src/libcore/str.rs:1020:8: 1020:17 error: multiple applicable implementations in scope
src/libcore/str.rs:1020     ret iter::all(s, char::is_whitespace);
                                ^~~~~~~~~

Notice that I got four errors for each of two call sites, and three of those four are identical.