Nix/doc/manual/rl-next/print-value-in-type-error.md

synopsis	issues	prs
Type errors include the failing value

In errors like value is an integer while a list was expected, the message now includes the failing value.

Before:

       error: value is a set while a string was expected

After:

       error: expected a string but found a set: { ghc810 = «thunk»;
       ghc8102Binary = «thunk»; ghc8107 = «thunk»; ghc8107Binary = «thunk»;
       ghc865Binary = «thunk»; ghc90 = «thunk»; ghc902 = «thunk»; ghc92 = «thunk»;
       ghc924Binary = «thunk»; ghc925 = «thunk»;  «17 attributes elided»}