Rename to Any#tryToShow as it's not Show-based

It was also being used over TypeComparer.ApproxState's show extension
method (for unclear reasons), so let's avoid name confusion too.

Author: dwijnand

compiler/src/dotty/tools/backend/sjs/JSExportsGen.scala

@@ -119,7 +119,7 @@ final class JSExportsGen(jsCodeGen: JSCodeGen)(using Context) {
       if (kind != overallKind) {
         bad = true
         report.error(
-            em"export overload conflicts with export of $firstSym: they are of different types (${kind.show} / ${overallKind.show})",
+            em"export overload conflicts with export of $firstSym: they are of different types (${kind.tryToShow} / ${overallKind.tryToShow})",
             info.pos)
       }
     }

compiler/src/dotty/tools/dotc/core/Decorators.scala

@@ -259,7 +259,7 @@ object Decorators {
     }
 
     /** Instead of `toString` call `show` on `Showable` values, falling back to `toString` if an exception is raised. */
-    def show(using Context): String = x match
+    def tryToShow(using Context): String = x match
       case x: Showable =>
         try x.show
         catch

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -596,7 +596,7 @@ object Parsers {
               if startIndentWidth <= nextIndentWidth then
                 i"""Line is indented too far to the right, or a `{` is missing before:
                    |
-                   |${t.show}"""
+                   |${t.tryToShow}"""
               else
                 in.spaceTabMismatchMsg(startIndentWidth, nextIndentWidth),
               in.next.offset

compiler/src/dotty/tools/dotc/printing/Formatting.scala

@@ -88,7 +88,7 @@ object Formatting {
    *     against accidentally treating an interpolated value as a margin.
    */
   class StringFormatter(protected val sc: StringContext) {
-    protected def showArg(arg: Any)(using Context): String = arg.show
+    protected def showArg(arg: Any)(using Context): String = arg.tryToShow
 
     private def treatArg(arg: Shown, suffix: String)(using Context): (Any, String) = arg match {
       case arg: Seq[?] if suffix.nonEmpty && suffix.head == '%' =>

compiler/src/dotty/tools/dotc/sbt/ExtractAPI.scala

@@ -776,7 +776,7 @@ private class ExtractAPICollector(using Context) extends ThunkHolder {
           case n: Name =>
             h = nameHash(n, h)
           case elem =>
-            cannotHash(what = i"`${elem.show}` of unknown class ${elem.getClass}", elem, tree)
+            cannotHash(what = i"`${elem.tryToShow}` of unknown class ${elem.getClass}", elem, tree)
       h
     end iteratorHash