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Always check if next_word() returned an empty string (if it hit eof).
Thanks Rebecca Allard for running into a crash when a .mu file ends with
'{' (without a following newline).
Open question: how to express the constraint that next_word() should
always check if its result is empty? Can *any* type system do that?!
Even the usual constraint that we must use a result isn't iron-clad: you
could save the result in a variable but then ignore it. Unless you go to
Go's extraordinary lengths of considering any dead code an error.
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Drop support for escape characters in dilated reagents. We haven't felt
the need for it yet, we have no tests for it, and eventually when we do
we want to treat escapes the way we treat them in the rest of the
language. (commit 3233)
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Standardize quotes around reagents in error messages.
I'm still sure there's issues. For example, the messages when
type-checking 'copy'. I'm not putting quotes around them because in
layer 60 I end up creating dilated reagents, and then it's a bit much to
have quotes and (two kinds of) brackets. But I'm sure I'm doing that
somewhere..
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Long-overdue reorganization to support general 'dilated' reagents up
front. This also allows me to move tests that are really about unrelated
layers out of layers dealing with parsing.
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