Ident(<term macro>)
Select(<any qualifier>, <term macro>)
TypeApply(<any of the above>, <targs>)
Apply(...Apply(<any of the above>, <args1>)...<argsN>)
Macro expansion
First of all macroExpandXXX:
1) If necessary desugars the expandee to fit into the default expansion scheme
that is understood by macroExpandWithRuntime / macroExpandWithoutRuntime
Then macroExpandWithRuntime:
2) Checks whether the expansion needs to be delayed
3) Loads macro implementation using macroMirror
4) Synthesizes invocation arguments for the macro implementation
5) Checks that the result is a tree or an expr bound to this universe
Finally macroExpandXXX:
6) Validates the expansion against the white list of supported tree shapes
7) Typechecks the result as required by the circumstances of the macro application
If -Ymacro-debug-lite is enabled, you will get basic notifications about macro expansion
along with macro expansions logged in the form that can be copy/pasted verbatim into REPL.
If -Ymacro-debug-verbose is enabled, you will get detailed log of how exactly this function
performs class loading and method resolution in order to load the macro implementation.
The log will also include other non-trivial steps of macro expansion.
returns
the expansion result if the expansion has been successful,
the fallback tree if the expansion has been unsuccessful, but there is a fallback,
the expandee unchanged if the expansion has been delayed,
the expandee fully expanded if the expansion has been delayed before and has been expanded now,
the expandee with an error marker set if the expansion has been cancelled due malformed arguments or implementation
the expandee with an error marker set if there has been an error
Performs macro expansion:
Expandable trees
A term of one of the following shapes:
Ident(<term macro>) Select(<any qualifier>, <term macro>) TypeApply(<any of the above>, <targs>) Apply(...Apply(<any of the above>, <args1>)...<argsN>)
Macro expansion
First of all
macroExpandXXX: 1) If necessary desugars theexpandeeto fit into the default expansion scheme that is understood bymacroExpandWithRuntime/macroExpandWithoutRuntimeThen
macroExpandWithRuntime: 2) Checks whether the expansion needs to be delayed 3) Loads macro implementation usingmacroMirror4) Synthesizes invocation arguments for the macro implementation 5) Checks that the result is a tree or an expr bound to this universeFinally
macroExpandXXX: 6) Validates the expansion against the white list of supported tree shapes 7) Typechecks the result as required by the circumstances of the macro applicationIf -Ymacro-debug-lite is enabled, you will get basic notifications about macro expansion along with macro expansions logged in the form that can be copy/pasted verbatim into REPL.
If -Ymacro-debug-verbose is enabled, you will get detailed log of how exactly this function performs class loading and method resolution in order to load the macro implementation. The log will also include other non-trivial steps of macro expansion.
the expansion result if the expansion has been successful, the fallback tree if the expansion has been unsuccessful, but there is a fallback, the expandee unchanged if the expansion has been delayed, the expandee fully expanded if the expansion has been delayed before and has been expanded now, the expandee with an error marker set if the expansion has been cancelled due malformed arguments or implementation the expandee with an error marker set if there has been an error