diff --git a/src/core/ambience-core.scala b/src/core/ambience-core.scala
index 9423948..66bcbde 100644
--- a/src/core/ambience-core.scala
+++ b/src/core/ambience-core.scala
@@ -23,9 +23,9 @@ import contingency.*
 //import language.experimental.captureChecking
 
 package workingDirectories:
-  given virtualMachine(using Errant[SystemPropertyError], SystemProperties): WorkingDirectory = () =>
+  given virtualMachine(using Tactic[SystemPropertyError], SystemProperties): WorkingDirectory = () =>
     Properties.user.dir[Text]()
 
 package homeDirectories:
-  given virtualMachine(using Errant[SystemPropertyError], SystemProperties): HomeDirectory = () =>
+  given virtualMachine(using Tactic[SystemPropertyError], SystemProperties): HomeDirectory = () =>
     Properties.user.home[Text]()
diff --git a/src/core/envvars.scala b/src/core/envvars.scala
index 5f90d70..d8c5c80 100644
--- a/src/core/envvars.scala
+++ b/src/core/envvars.scala
@@ -38,19 +38,19 @@ object Environment extends Dynamic:
   def apply[VariableType](variable: Text)
       (using environment:      Environment,
              reader:           EnvironmentVariable[Label, VariableType],
-             environmentError: Errant[EnvironmentError])
+             environmentError: Tactic[EnvironmentError])
           : VariableType^{environment, reader, environmentError} =
 
-    environment.variable(variable).let(reader.read).or(raise(EnvironmentError(variable))(reader.read(Text(""))))
+    environment.variable(variable).let(reader.read).or(raise(EnvironmentError(variable), reader.read(Text(""))))
 
   inline def selectDynamic[VariableType](key: String)
       (using environment:      Environment,
              reader:           EnvironmentVariable[key.type, VariableType],
-             environmentError: Errant[EnvironmentError])
+             environmentError: Tactic[EnvironmentError])
           : VariableType^{environment, reader, environmentError} =
 
     environment.variable(reader.defaultName).let(reader.read(_)).or:
-      raise(EnvironmentError(reader.defaultName))(reader.read(Text("")))
+      raise(EnvironmentError(reader.defaultName), reader.read(Text("")))
 
 @capability
 trait EnvironmentVariable[AliasType <: Label, +VariableType] extends Pure:
@@ -113,7 +113,7 @@ object EnvironmentVariable extends EnvironmentVariable2:
   given [PathType: SpecificPath] => EnvironmentVariable["editor", PathType] as editor = SpecificPath(_)
   given [PathType: SpecificPath] => EnvironmentVariable["pager", PathType] as pager = SpecificPath(_)
 
-  given (using Errant[NumberError]) => EnvironmentVariable["sshAgentPid", Pid] as sshAgentPid =
+  given (using Tactic[NumberError]) => EnvironmentVariable["sshAgentPid", Pid] as sshAgentPid =
     text => Pid(text.decodeAs[Int])
 
   given sshAuthSock[PathType: SpecificPath]: EnvironmentVariable["sshAuthSock", PathType] = SpecificPath(_)
diff --git a/src/core/properties.scala b/src/core/properties.scala
index 010c0dc..0488f61 100644
--- a/src/core/properties.scala
+++ b/src/core/properties.scala
@@ -39,7 +39,7 @@ object Properties extends Dynamic:
   def apply[PropertyType](property: Text)
       (using properties:     SystemProperties,
              reader:         SystemProperty[String, PropertyType],
-             systemProperty: Errant[SystemPropertyError])
+             systemProperty: Tactic[SystemPropertyError])
           : PropertyType^{properties, reader, systemProperty} =
 
     properties(property).let(reader.read).or(abort(SystemPropertyError(property)))
@@ -57,13 +57,13 @@ object SystemProperty:
   given javaHome[PathType: SpecificPath]: SystemProperty["java.home", PathType] = SpecificPath(_)
 
   given javaLibraryPath[PathType: SpecificPath]
-      (using systemProperties: SystemProperties, systemProperty: Errant[SystemPropertyError])
+      (using systemProperties: SystemProperties, systemProperty: Tactic[SystemPropertyError])
           : SystemProperty["java.library.path", List[PathType]] =
 
     _.cut(systemProperties(t"path.separator").or(t":")).to(List).map(SpecificPath(_))
 
   given javaClassPath[PathType: SpecificPath]
-      (using systemProperties: SystemProperties, systemProperty: Errant[SystemPropertyError])
+      (using systemProperties: SystemProperties, systemProperty: Tactic[SystemPropertyError])
           : SystemProperty["java.class.path", List[PathType]] =
 
     _.cut(systemProperties(t"path.separator").or(t":")).to(List).map(SpecificPath(_))
@@ -72,7 +72,7 @@ object SystemProperty:
   given javaRuntimeVersion: SystemProperty["java.runtime.version", Text] = identity(_)
 
   given javaExtDirs[PathType: SpecificPath]
-      (using systemProperties: SystemProperties, systemProperty: Errant[SystemPropertyError])
+      (using systemProperties: SystemProperties, systemProperty: Tactic[SystemPropertyError])
           : SystemProperty["java.ext.dirs", List[PathType]] =
 
     _.cut(systemProperties(t"path.separator").or(t":")).to(List).map(SpecificPath(_))
@@ -101,7 +101,7 @@ case class PropertyAccess[NameType <: String](property: String) extends Dynamic:
   def applyDynamic[PropertyType](key: String)()
       (using properties:     SystemProperties,
              reader:         SystemProperty[NameType+"."+key.type, PropertyType],
-             systemProperty: Errant[SystemPropertyError])
+             systemProperty: Tactic[SystemPropertyError])
           : PropertyType^{properties, reader, systemProperty} =
 
     properties((property+"."+key).tt).let(reader.read(_)).or:
@@ -110,7 +110,7 @@ case class PropertyAccess[NameType <: String](property: String) extends Dynamic:
   inline def apply[PropertyType]()
       (using properties: SystemProperties,
              reader: SystemProperty[NameType, PropertyType],
-             systemProperty: Errant[SystemPropertyError])
+             systemProperty: Tactic[SystemPropertyError])
           : PropertyType^{properties, reader, systemProperty} =
 
     properties(valueOf[NameType].tt).let(reader.read(_)).or: