Information about one of the currently considered implicit candidates.
Infers an implicit value of the expected type pt
in the macro callsite context.
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, TypecheckException
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
of the type from
to the type to
in the macro callsite context.
Infers an implicit view from the provided tree tree
of 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.
If silent
is false, TypecheckException
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.
Information about one of the currently considered implicit candidates.
Information about one of the currently considered implicit candidates. Candidates are used in plural form, because implicit parameters may themselves have implicit parameters, hence implicit searches can recursively trigger other implicit searches.
Can be useful to get information about an application with an implicit parameter that is materialized during current macro expansion. If we're in an implicit macro being expanded, it's included in this list.
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, TypecheckException
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
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).
EXPERIMENTAL
A slice of the Scala macros context that partially exposes the type checker to macro writers.