Proposal: Left-Associative Semigroup Operator Alias in "Data.Semigroup"

[Herbert Valerio Riedel]

Hello!

In short, the right-associative fixity of (Data.{Monoid,Semigroup}.<>)
subtly conflicts with definitions of (<>) in pretty printing APIs, for
which the left-associative variant is sometimes desirable. This subtle
overloading of (<>) is error-prone, as one has to remember which version
of (<>) is currently in scope in order to be able to reason about
non-trivial expressions involving this operator.

This proposal is an attempt to resolve this unfortunate and confusing
situation by completing the `Semigroup`/`Monoid` vocabulary with a
standard left-associative alias. Please see

  https://ghc.haskell.org/trac/ghc/wiki/Proposal/LeftAssocSemigroupOp

for more details.

Discussion period: 4 weeks
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