slice and array re-work plus some misc. changes

 * `@truncate` builtin allows casting to the same size integer.
   It also performs two's complement casting between signed and
   unsigned integers.
 * The idiomatic way to convert between bytes and numbers is now
   `mem.readInt` and `mem.writeInt` instead of an unsafe cast.
   It works at compile time, is safer, and looks cleaner.
 * Implicitly casting an array to a slice is allowed only if the
   slice is const.
 * Constant pointer values know if their memory is from a compile-
   time constant value or a compile-time variable.
 * Cast from [N]u8 to []T no longer allowed, but [N]u8 to []const T
   still allowed.
 * Fix inability to pass a mutable pointer to comptime variable at
   compile-time to a function and have the function modify the
   memory pointed to by the pointer.
 * Add the `comptime T: type` parameter back to mem.eql. Prevents
   accidentally creating instantiations for arrays.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/cases/error.zig b/test/cases/error.zig
index 20fba13f90..eeed337141 100644
--- a/test/cases/error.zig
+++ b/test/cases/error.zig
@@ -28,8 +28,8 @@ fn gimmeItBroke() -> []const u8 {
 
 fn errorName() {
     @setFnTest(this);
-    assert(mem.eql(@errorName(error.AnError), "AnError"));
-    assert(mem.eql(@errorName(error.ALongerErrorName), "ALongerErrorName"));
+    assert(mem.eql(u8, @errorName(error.AnError), "AnError"));
+    assert(mem.eql(u8, @errorName(error.ALongerErrorName), "ALongerErrorName"));
 }
 error AnError;
 error ALongerErrorName;