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Expr.valueOrAbort
and reflect.report.errorAndAbort
Provides a homogeneous and unambiguous concept for stopping the expansion of a macro. The advantages of this naming are * Consistent name suffixes `xyzAbort` * `report.e` will show auto-completion for all variants of `error` and `errorAndAbort` * `Abort` cannot be confused with other kinds of error handling in this API
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Original file line number | Diff line number | Diff line change |
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@@ -1,4 +1,9 @@ | ||
package scala.quoted.runtime | ||
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/** Throwable used to stop the expansion of a macro after an error was reported */ | ||
class StopMacroExpansion extends Throwable | ||
/** Throwable used to abort the expansion of a macro after an error was reported */ | ||
class StopMacroExpansion extends Throwable: | ||
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// Do not fill the stacktrace for performance. | ||
// We know that the stacktrace will be ignored | ||
// and only the reported error message will be used. | ||
override def fillInStackTrace(): Throwable = this |
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Original file line number | Diff line number | Diff line change |
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@@ -1,4 +1,4 @@ | ||
import scala.quoted.* | ||
trait Bar | ||
inline given Bar = ${ impl } | ||
def impl(using Quotes): Expr[Bar] = quotes.reflect.report.throwError("Failed to expand!") | ||
def impl(using Quotes): Expr[Bar] = quotes.reflect.report.errorAndAbort("Failed to expand!") |
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Original file line number | Diff line number | Diff line change |
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@@ -1,4 +1,4 @@ | ||
import scala.quoted._ | ||
trait Bar | ||
transparent inline given Bar = ${ impl } | ||
def impl(using Quotes): Expr[Bar] = quotes.reflect.report.throwError("Failed to expand!") | ||
def impl(using Quotes): Expr[Bar] = quotes.reflect.report.errorAndAbort("Failed to expand!") |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,6 @@ | ||
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-- Error: tests/neg-macros/ill-abort/quoted_2.scala:1:15 --------------------------------------------------------------- | ||
1 |def test = fail() // error | ||
| ^^^^^^ | ||
| A StopMacroExpansion was thrown without any errors reported while expanding a macro. This macro has a bug. | ||
| This location contains code that was inlined from quoted_1.scala:3 |
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Original file line number | Diff line number | Diff line change |
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import scala.quoted.* | ||
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inline def fail(): Unit = ${ impl } | ||
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private def impl(using Quotes) : Expr[Unit] = | ||
// should never be done without reporting error before (see docs) | ||
throw new scala.quoted.runtime.StopMacroExpansion |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1 @@ | ||
def test = fail() // error |
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