Correct offset for single-string interpolation

compiler/src/dotty/tools/dotc/ast/Desugar.scala

@@ -1665,7 +1665,7 @@ object desugar {
           case t => t
         }
         // This is a deliberate departure from scalac, where StringContext is not rooted (See #4732)
-        Apply(Select(Apply(scalaDot(nme.StringContext), strs), id), elems)
+        Apply(Select(Apply(scalaDot(nme.StringContext), strs), id).withSpan(tree.span), elems)
       case PostfixOp(t, op) =>
         if ((ctx.mode is Mode.Type) && !isBackquoted(op) && op.name == tpnme.raw.STAR) {
           val seqType = if (ctx.compilationUnit.isJava) defn.ArrayType else defn.SeqType

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

@@ -1245,12 +1245,12 @@ object Parsers {
               }
             })
 
-      if (in.token == STRINGPART)
-        nextSegment(in.offset + (if (isTripleQuoted) 3 else 1))
+      var offsetCorrection = if isTripleQuoted then 3 else 1
       while (in.token == STRINGPART)
-        nextSegment(in.offset)
+        nextSegment(in.offset + offsetCorrection)
+        offsetCorrection = 0
       if (in.token == STRINGLIT)
-        segmentBuf += literal(inPattern = inPattern, negOffset = in.offset, inStringInterpolation = true)
+        segmentBuf += literal(inPattern = inPattern, negOffset = in.offset + offsetCorrection, inStringInterpolation = true)
 
       InterpolatedString(interpolator, segmentBuf.toList)
     }

compiler/test-resources/repl/i6676

@@ -7,8 +7,8 @@ scala> xml"
   |     ';' expected, but eof found
 scala> xml""
 1 | xml""
-  |    ^
-  |    value xml is not a member of StringContext
+  | ^^^^^
+  | value xml is not a member of StringContext
 scala> xml"""
 1 | xml"""
   |    ^

tests/semanticdb/expect/Givens.expect.scala

@@ -4,11 +4,11 @@ package b
 object Givens/*<-a::b::Givens.*/:
 
   extension on [A](any: A):
-    def /*<-a::b::Givens.extension_sayHello_A.*//*<-a::b::Givens.extension_sayHello_A.sayHello().[A]*//*<-a::b::Givens.extension_sayHello_A.sayHello().(any)*//*->a::b::Givens.extension_sayHello_A.sayHello().[A]*/sayHello/*<-a::b::Givens.extension_sayHello_A.sayHello().*/ = s"/*->scala::StringContext.apply().*/Hello, I am $any/*->a::b::Givens.extension_sayHello_A.sayHello().(any)*//*->scala::StringContext#s().*/"
+    def /*<-a::b::Givens.extension_sayHello_A.*//*<-a::b::Givens.extension_sayHello_A.sayHello().[A]*//*<-a::b::Givens.extension_sayHello_A.sayHello().(any)*//*->a::b::Givens.extension_sayHello_A.sayHello().[A]*/sayHello/*<-a::b::Givens.extension_sayHello_A.sayHello().*/ = s"/*->scala::StringContext.apply().*/Hello, I am $any/*->a::b::Givens.extension_sayHello_A.sayHello().(any)*/"/*->scala::StringContext#s().*/
 
   extension on [B](any: B):
-    def sa/*<-a::b::Givens.extension_sayGoodbye_B.*//*<-a::b::Givens.extension_sayGoodbye_B.sayGoodbye().[B]*//*<-a::b::Givens.extension_sayGoodbye_B.saySoLong().[B]*//*<-a::b::Givens.extension_sayGoodbye_B.sayGoodbye().(any)*//*<-a::b::Givens.extension_sayGoodbye_B.saySoLong().(any)*//*->a::b::Givens.extension_sayGoodbye_B.sayGoodbye().[B]*//*->a::b::Givens.extension_sayGoodbye_B.saySoLong().[B]*/yGoodbye/*<-a::b::Givens.extension_sayGoodbye_B.sayGoodbye().*/ = s"/*->scala::StringContext.apply().*/Goodbye, from $any/*->a::b::Givens.extension_sayGoodbye_B.sayGoodbye().(any)*//*->scala::StringContext#s().*/"
-    def saySoLong/*<-a::b::Givens.extension_sayGoodbye_B.saySoLong().*/ = s"/*->scala::StringContext.apply().*/So Long, from $any/*->a::b::Givens.extension_sayGoodbye_B.saySoLong().(any)*//*->scala::StringContext#s().*/"
+    def sa/*<-a::b::Givens.extension_sayGoodbye_B.*//*<-a::b::Givens.extension_sayGoodbye_B.sayGoodbye().[B]*//*<-a::b::Givens.extension_sayGoodbye_B.saySoLong().[B]*//*<-a::b::Givens.extension_sayGoodbye_B.sayGoodbye().(any)*//*<-a::b::Givens.extension_sayGoodbye_B.saySoLong().(any)*//*->a::b::Givens.extension_sayGoodbye_B.sayGoodbye().[B]*//*->a::b::Givens.extension_sayGoodbye_B.saySoLong().[B]*/yGoodbye/*<-a::b::Givens.extension_sayGoodbye_B.sayGoodbye().*/ = s"/*->scala::StringContext.apply().*/Goodbye, from $any/*->a::b::Givens.extension_sayGoodbye_B.sayGoodbye().(any)*/"/*->scala::StringContext#s().*/
+    def saySoLong/*<-a::b::Givens.extension_sayGoodbye_B.saySoLong().*/ = s"/*->scala::StringContext.apply().*/So Long, from $any/*->a::b::Givens.extension_sayGoodbye_B.saySoLong().(any)*/"/*->scala::StringContext#s().*/
 
   val hello1/*<-a::b::Givens.hello1.*/ = /*->a::b::Givens.extension_sayHello_A.sayHello().*/1.sayHello
   val goodbye1/*<-a::b::Givens.goodbye1.*/ = /*->a::b::Givens.extension_sayGoodbye_B.sayGoodbye().*/1.sayGoodbye

tests/semanticdb/expect/ImplicitConversion.expect.scala

@@ -21,10 +21,10 @@ class ImplicitConversion/*<-example::ImplicitConversion#*/ {
   val x/*<-example::ImplicitConversion#x.*/: Int/*->scala::Int#*/ = /*->example::ImplicitConversion#string2Number().*/message/*->example::ImplicitConversion#message.*/
 
   // interpolators
-  s"/*->scala::StringContext.apply().*/Hello $message/*->example::ImplicitConversion#message.*/ $number/*->example::ImplicitConversion#number.*//*->scala::StringContext#s().*/"
+  s"/*->scala::StringContext.apply().*/Hello $message/*->example::ImplicitConversion#message.*/ $number/*->example::ImplicitConversion#number.*/"/*->scala::StringContext#s().*/
   /*->scala::Predef.augmentString().*/s"""/*->scala::StringContext.apply().*/Hello
      |$message/*->example::ImplicitConversion#message.*/
-     |$number/*->example::ImplicitConversion#number.*//*->scala::StringContext#s().*/""".stripMargin/*->scala::collection::StringOps#stripMargin(+1).*/
+     |$number/*->example::ImplicitConversion#number.*/"""/*->scala::StringContext#s().*/.stripMargin/*->scala::collection::StringOps#stripMargin(+1).*/
 
   val a/*<-example::ImplicitConversion#a.*/: Int/*->scala::Int#*/ = /*->scala::Char.char2int().*/char/*->example::ImplicitConversion#char.*/
   val b/*<-example::ImplicitConversion#b.*/: Long/*->scala::Long#*/ = /*->scala::Char.char2long().*/char/*->example::ImplicitConversion#char.*/

tests/semanticdb/metac.expect

@@ -1315,7 +1315,7 @@ Occurrences:
 [6:8..6:16): sayHello <- a/b/Givens.extension_sayHello_A.sayHello().
 [6:21..6:21): -> scala/StringContext.apply().
 [6:34..6:37): any -> a/b/Givens.extension_sayHello_A.sayHello().(any)
-[6:37..6:37): -> scala/StringContext#s().
+[6:37..6:38): " -> scala/StringContext#s().
 [8:16..9:10): <- a/b/Givens.extension_sayGoodbye_B.
 [8:16..8:17): B <- a/b/Givens.extension_sayGoodbye_B.sayGoodbye().[B]
 [8:16..8:17): B <- a/b/Givens.extension_sayGoodbye_B.saySoLong().[B]
@@ -1326,11 +1326,11 @@ Occurrences:
 [9:8..9:18): sayGoodbye <- a/b/Givens.extension_sayGoodbye_B.sayGoodbye().
 [9:23..9:23): -> scala/StringContext.apply().
 [9:38..9:41): any -> a/b/Givens.extension_sayGoodbye_B.sayGoodbye().(any)
-[9:41..9:41): -> scala/StringContext#s().
+[9:41..9:42): " -> scala/StringContext#s().
 [10:8..10:17): saySoLong <- a/b/Givens.extension_sayGoodbye_B.saySoLong().
 [10:22..10:22): -> scala/StringContext.apply().
 [10:37..10:40): any -> a/b/Givens.extension_sayGoodbye_B.saySoLong().(any)
-[10:40..10:40): -> scala/StringContext#s().
+[10:40..10:41): " -> scala/StringContext#s().
 [12:6..12:12): hello1 <- a/b/Givens.hello1.
 [12:15..12:15): -> a/b/Givens.extension_sayHello_A.sayHello().
 [13:6..13:14): goodbye1 <- a/b/Givens.goodbye1.
@@ -1445,12 +1445,12 @@ Occurrences:
 [23:4..23:4): -> scala/StringContext.apply().
 [23:11..23:18): message -> example/ImplicitConversion#message.
 [23:20..23:26): number -> example/ImplicitConversion#number.
-[23:26..23:26): -> scala/StringContext#s().
+[23:26..23:27): " -> scala/StringContext#s().
 [24:2..24:2): -> scala/Predef.augmentString().
 [24:6..24:6): -> scala/StringContext.apply().
 [25:7..25:14): message -> example/ImplicitConversion#message.
 [26:7..26:13): number -> example/ImplicitConversion#number.
-[26:13..26:13): -> scala/StringContext#s().
+[26:15..26:16): " -> scala/StringContext#s().
 [26:17..26:28): stripMargin -> scala/collection/StringOps#stripMargin(+1).
 [28:6..28:7): a <- example/ImplicitConversion#a.
 [28:9..28:12): Int -> scala/Int#