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String interpolation with f"" causes compilation failure #8091

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scabug opened this issue Dec 18, 2013 · 5 comments
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String interpolation with f"" causes compilation failure #8091

scabug opened this issue Dec 18, 2013 · 5 comments
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@scabug
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@scabug scabug commented Dec 18, 2013

Doing this in the REPL. Worked Monday 16/12, stopped working Tuesday 17/12.
{code}
scala> "börk börk" flatMap (ch ⇒ if (ch > 127) f"&#x${ch}%04x;" else "" + ch)
:8: error: type mismatch;
found : Comparable[String]
required: scala.collection.GenTraversableOnce[?]
"börk börk" flatMap (ch ⇒ if (ch > 127) f"&#x${ch}%04x;" else "" + ch)
{code} ^

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@scabug scabug commented Dec 18, 2013

Imported From: https://issues.scala-lang.org/browse/SI-8091?orig=1
Reporter: Björn Antonsson (bjorn.antonsson)
Affected Versions: 2.11.0-M7

@scabug
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@scabug scabug commented Dec 18, 2013

@paulp said:
ca2dbe55eb

"In this formulation, it becomes apparent that the first typecheck is redundant. If something is ascribed with some type, then typechecking the ascription against that type does nothing useful."

...except maybe induce an implicit conversion, as in from String => StringOps.

@scabug
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@scabug scabug commented Dec 18, 2013

@xeno-by said:
It's actually scala/scala@a3b3341. The whitebox change is at fault here, because fast track macros are considered whitebox by default.

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@scabug scabug commented Dec 18, 2013

@scabug
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@scabug scabug commented Dec 19, 2013

@paulp said:
Man, I thought I could shoot from the hip this one time.

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