Fix toString for PositionBridge #12735
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There are compile call paths relying on meaningful toString impl. for error/warning log messages. Therefor lets add toString, which is: "concise but informative representation that is easy for a person to read." Without this, e.g. users of https://github.com/davidB/scala-maven-plugin get unsuitable compile problems like: [Warn] dotty.tools.xsbt.PositionBridge@4fbdc20: match may not be exhaustive.... Example call path: log:45, SbtLogger (sbt_inc) log:47, Logger (sbt.util) warn:43, Logger (sbt.util) logWarning:159, LoggedReporter (sbt.internal.inc) display:168, LoggedReporter (sbt.internal.inc) log:142, LoggedReporter (sbt.internal.inc) doReport:43, DelegatingReporter (dotty.tools.xsbt) report:150, Reporter (dotty.tools.dotc.reporting) issueWarning:32, report$ (dotty.tools.dotc) warning:67, report$ (dotty.tools.dotc) checkExhaustivity:847, SpaceEngine (dotty.tools.dotc.transform.patmat) ....
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Please let me know, if I can help to get this PR merged, as this fixes for us a blocker to upgrade to Scala3. |
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I migrated a small project to Scala3, using https://github.com/davidB/scala-maven-plugin.
If everything compiles fine, all good.
But if their is a compile error or warning, instead of showing the source position eg.
path/file.scala:120of the compilation problem, the following is shown instead:[ERROR] dotty.tools.xsbt.PositionBridge@767bb276: could not find Lazy implicit value of type ....It looks like a specific toString impl is missing, and the
Object.toStringis used instead, which is not very helpful for the user to fix compilation problem. 😅 Check for more examples: davidB/scala-maven-plugin#477I debugged the compilation and I think I found the place where the toString of the position is called: https://github.com/sbt/sbt/blob/develop/internal/util-logging/src/main/scala/sbt/util/InterfaceUtil.scala#L176
Even if SBT is relying on an undocumented behavior of the toString of some classes, which should probably be fixed in SBT, a more helpful toString for PositionBridge should not make any harm either.
This PR therefor adds a very basic, but helpful toString impl to PositionBridge.
Note that the other field src is also part of pos, so I skipped it in the toString, to not get the information twice.
Example call path: