Represents an error during typechecking
Infers an implicit value of the expected type pt in the macro callsite context.
Optional
pos parameter provides a position that will be associated with the implicit search.
Infers an implicit value of the expected type pt in the macro callsite context.
Optional
pos parameter provides a position that will be associated with the implicit search.
If silent is false,
TypeError will be thrown in case of an inference error.
If
silent is true, the typecheck is silent and will return
EmptyTree if an error occurs.
Such errors don't vanish and can be inspected by turning on -Xlog-implicits.
Unlike in
typeCheck,
silent is true by default.
Infers an implicit view from the provided tree tree from the type
from to the type
to in the macro callsite context.
Infers an implicit view from the provided tree tree from the type
from to the type
to in the macro callsite context.
Optional pos parameter provides a position that will be associated with the implicit search.
Another optional parameter,
controls whether ambiguous implicit errors should be reported.
If we search for a view simply to find out whether one type is coercible to another, it might be desirable to set this flag to reportAmbiguous
false.
If silent is false,
TypeError will be thrown in case of an inference error.
If
silent is true, the typecheck is silent and will return
EmptyTree if an error occurs.
Such errors don't vanish and can be inspected by turning on -Xlog-implicits.
Unlike in
typeCheck,
silent is true by default.
Types along with corresponding trees for which implicit arguments are currently searched.
Types along with corresponding trees for which implicit arguments are currently searched. Can be useful to get information about an application with an implicit parameter that is materialized during current macro expansion.
Unlike enclosingImplicits
, this is a def, which means that it gets recalculated on every invocation,
so it might change depending on what is going on during macro expansion.
Contexts that represent macros in-flight, including the current one.
Contexts that represent macros in-flight, including the current one. Very much like a stack trace, but for macros only. Can be useful for interoperating with other macros and for imposing compiler-friendly limits on macro expansion.
Is also priceless for emitting sane error messages for macros that are called by other macros on synthetic (i.e. position-less) trees.
In that dire case navigate the openMacros stack, and it will most likely contain at least one macro with a position-ful macro application.
See
enclosingPosition for a default implementation of this logic.
Unlike enclosingMacros
, this is a def, which means that it gets recalculated on every invocation,
so it might change depending on what is going on during macro expansion.
Recursively resets symbols and types in a given tree.
Recursively resets symbols and types in a given tree.
Note that this does not revert the tree to its pre-typer shape. For more info, read up https://issues.scala-lang.org/browse/SI-5464.
Recursively resets locally defined symbols and types in a given tree.
Recursively resets locally defined symbols and types in a given tree.
Note that this does not revert the tree to its pre-typer shape. For more info, read up https://issues.scala-lang.org/browse/SI-5464.
Typechecks the provided tree against the expected type pt in the macro callsite context.
Typechecks the provided tree against the expected type pt in the macro callsite context.
If silent is false,
TypeError will be thrown in case of a typecheck error.
If
silent is true, the typecheck is silent and will return
EmptyTree if an error occurs.
Such errors don't vanish and can be inspected by turning on -Ymacro-debug-verbose.
Unlike in
inferImplicitValue and
inferImplicitView,
silent is false by default.
Typechecking can be steered with the following optional parameters:
withImplicitViewsDisabled recursively prohibits implicit views (though, implicit vals will still be looked up and filled in), default value is false
withMacrosDisabled recursively prohibits macro expansions and macro-based implicits, default value is false
Test two objects for inequality.
Test two objects for inequality.
true
if !(this == that), false otherwise.
Equivalent to x.hashCode
except for boxed numeric types and null
.
Equivalent to x.hashCode
except for boxed numeric types and null
.
For numerics, it returns a hash value which is consistent
with value equality: if two value type instances compare
as true, then ## will produce the same hash value for each
of them.
For null
returns a hashcode where null.hashCode
throws a
NullPointerException
.
a hash value consistent with ==
Test two objects for equality.
Test two objects for equality.
The expression x == that
is equivalent to if (x eq null) that eq null else x.equals(that)
.
true
if the receiver object is equivalent to the argument; false
otherwise.
Cast the receiver object to be of type T0
.
Cast the receiver object to be of type T0
.
Note that the success of a cast at runtime is modulo Scala's erasure semantics.
Therefore the expression 1.asInstanceOf[String]
will throw a ClassCastException
at
runtime, while the expression List(1).asInstanceOf[List[String]]
will not.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the requested type.
the receiver object.
if the receiver object is not an instance of the erasure of type T0
.
Create a copy of the receiver object.
Tests whether the argument (arg0
) is a reference to the receiver object (this
).
Tests whether the argument (arg0
) is a reference to the receiver object (this
).
The eq
method implements an equivalence relation on
non-null instances of AnyRef
, and has three additional properties:
x
and y
of type AnyRef
, multiple invocations of
x.eq(y)
consistently returns true
or consistently returns false
.x
of type AnyRef
, x.eq(null)
and null.eq(x)
returns false
.null.eq(null)
returns true
. When overriding the equals
or hashCode
methods, it is important to ensure that their behavior is
consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2
), they
should be equal to each other (o1 == o2
) and they should hash to the same value (o1.hashCode == o2.hashCode
).
true
if the argument is a reference to the receiver object; false
otherwise.
The equality method for reference types.
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize
method is invoked, as
well as the interaction between finalize
and non-local returns
and exceptions, are all platform dependent.
Returns string formatted according to given format
string.
Returns string formatted according to given format
string.
Format strings are as for String.format
(@see java.lang.String.format).
A representation that corresponds to the dynamic class of the receiver object.
A representation that corresponds to the dynamic class of the receiver object.
The nature of the representation is platform dependent.
a representation that corresponds to the dynamic class of the receiver object.
not specified by SLS as a member of AnyRef
The hashCode method for reference types.
Test whether the dynamic type of the receiver object is T0
.
Test whether the dynamic type of the receiver object is T0
.
Note that the result of the test is modulo Scala's erasure semantics.
Therefore the expression 1.isInstanceOf[String]
will return false
, while the
expression List(1).isInstanceOf[List[String]]
will return true
.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the specified type.
true
if the receiver object is an instance of erasure of type T0
; false
otherwise.
Equivalent to !(this eq that)
.
Equivalent to !(this eq that)
.
true
if the argument is not a reference to the receiver object; false
otherwise.
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
a String representation of the object.
(typers: StringAdd).self
(typers: StringFormat).self
(typers: ArrowAssoc[Typers]).x
(Since version 2.10.0) Use leftOfArrow
instead
(typers: Ensuring[Typers]).x
(Since version 2.10.0) Use resultOfEnsuring
instead