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Closing the REPL with Ctrl+D does not issue a newline, so the user's
prompt displays on the same line as the `scala>` prompt. This is bad.
We now force a newline before closing the interpreter, and display
`:quit` while we're at it so that people know how to exit the REPL
(since `exit` doesn't exist anymore).
The tricky part was to only add a newline when the console is
interrupted, and *not* when it is closed by a command (like `:quit`),
since commands are processed after their text (including newline) has
been sent to the console.
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Simplified the code paths to just use one of two `Wrapper` types
for textual templating.
Simplified the class-based template to use the same `$iw` name
for the both the class and the wrapper value. In addition,
the $read value is an object extending $read, instead of containing
an extra instance field, which keeps paths to values the same
for both templates.
Both styles trigger loading the value object by referencing the
value that immediately wraps the user code, although for the
class style, inner vals are eager and it would suffice to load
the enclosing `$read` object.
The proposed template included extra vals for values imported
from history, but this is not necessary since such an import
is always a stable path. (Or, counter-example to test is welcome.)
The test for t5148 is updated as a side effect. Probably internal
APIs don't make good test subjects.
Modify -Y option message.
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