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Update blog/_posts/2022-08-05-long-term-compatibility-plans.md
Co-authored-by: Jamie Thompson <bishbashboshjt@gmail.com>
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blog/_posts/2022-08-05-long-term-compatibility-plans.md

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@@ -24,7 +24,7 @@ We say that two compiler versions are source compatible if every single project
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Also, it is worth noting that breaking source compatibility is usually not a big deal, as it can be easily detected at compile time. Fixing those problems in the past usually only involved specifying explicit types in some places where the programmer used type inference. If your project is affected by breakage in the source compatibility, you often need to make only small adjustments. In the worst-case scenario, you will be locked on one version of the compiler for some time. That, however, will not affect projects depending on your code.
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Output compatibility (sometimes called *binary compatibility*, especially in Scala 2 contexts) is much more tricky and essential for our long-term plans for Scala. In the rest of this post, the term *compatibility* will always refer to output compatibility. We can say that compiler `A` is output compatible with compiler `B` when compiler `B` can use the output (binaries and TASTy files) generated by compiler `A` and understands it correctly.
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Output compatibility (sometimes called *binary compatibility*, especially in Scala 2 contexts) is much more tricky and essential for our long-term plans for Scala. In the rest of this post, the term *compatibility* will always refer to output compatibility. We can say that compiler `A` is output compatible with compiler `B` when compiler `B` can use the output (binaries and TASTy files) generated by compiler `A` and understand it correctly.
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We can further subdivide compatibility to forward and backward. We say that the two versions are forward compatible when the older compiler can depend on the output of the newer one. Conversely, backward compatibility means that the newer compiler can use the output of the older version. Scala 3 guarantees backward compatibility between all releases and forward compatibility between patch releases in the same minor line. That means that Scala `3.a.x` can consume the output of Scala `3.b.y` only if `a` is greater or equal to `b`. For example, the output of the Scala 3.0.2 compiler can be used by Scala 3.0.1 or 3.1.0. On the other hand, code compiled with Scala 3.1.0 cannot be a dependency of any project compiled with 3.0.2.
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