fixes#24099
If an arbitrary expression without a proc type (in this case
`tyFromExpr`) is called, the compiler [passes it to overload
resolution](793cee4de1/compiler/semexprs.nim (L1223)).
But overload resolution also can't handle arbitrary expressions and
treats them as not participating at all, matching with the state
`csEmpty`. The compiler checks for this and gives an "identifier
expected" error. Instead, now if we are in a generic context and an
arbitrary expression call matched with `csEmpty`, we now return
`csNoMatch` so that `semResolvedCall` can leave it untyped as
appropriate.
The expression flag `efNoDiagnostics` is replaced with this check. It's
not checked anywhere else and the only place that uses it is
`handleCaseStmtMacro`. Replacing it with `efNoUndeclared`, we just get
`csEmpty` instead of `csNoMatch`, which is handled the same way here. So
`efNoDiagnostics` is now removed and `efNoUndeclared` is used instead.
fixes#16376
The way the compiler handled generic proc instantiations in calls (like
`foo[int](...)`) up to this point was to instantiate `foo[int]`, create
a symbol for the instantiated proc (or a symchoice for multiple procs
excluding ones with mismatching generic param counts), then perform
overload resolution on this symbol/symchoice. The exception to this was
when the called symbol was already a symchoice node, in which case it
wasn't instantiated and overloading was called directly ([these
lines](b7b1313d21/compiler/semexprs.nim (L3366-L3371))).
This has several problems:
* Templates and macros can't create instantiated symbols, so they
couldn't participate in overloaded explicit generic instantiations,
causing the issue #16376.
* Every single proc that can be instantiated with the given generic
params is fully instantiated including the body. #9997 is about this but
isn't fixed here since the instantiation isn't in a call.
The way overload resolution handles explicit instantiations by itself is
also buggy:
* It doesn't check constraints.
* It allows only partially providing the generic parameters, which makes
sense for implicit generics, but can cause ambiguity in overloading.
Here is how this PR deals with these problems:
* Overload resolution now always handles explicit generic instantiations
in calls, in `initCandidate`, as long as the symbol resolves to a
routine symbol.
* Overload resolution now checks the generic params for constraints and
correct parameter count (ignoring implicit params). If these don't
match, the entire overload is considered as not matching and not
instantiated.
* Special error messages are added for mismatching/missing/extra generic
params. This is almost all of the diff in `semcall`.
* Procs with matching generic parameters now instantiate only the type
of the signature in overload resolution, not the proc itself, which also
works for templates and macros.
Unfortunately we can't entirely remove instantiations because overload
resolution can't handle some cases with uninstantiated types even though
it's resolved in the binding (see the last 2 blocks in
`texplicitgenerics`). There are also some instantiation issues with
default params that #24005 didn't fix but I didn't want this to become
the 3rd huge generics PR in a row so I didn't dive too deep into trying
to fix them. There is still a minor instantiation fix in `semtypinst`
though for subscripts in calls.
Additional changes:
* Overloading of `[]` wasn't documented properly, it somewhat is now
because we need to mention the limitation that it can't be done for
generic procs/types.
* Tests can now enable the new type mismatch errors with just
`-d:testsConciseTypeMismatch` in the command.
Package PRs:
- using fork for now:
[combparser](https://github.com/PMunch/combparser/pull/7) (partial
generic instantiation)
- merged: [cligen](https://github.com/c-blake/cligen/pull/233) (partial
generic instantiation but non-overloaded + template)
- merged: [neo](https://github.com/andreaferretti/neo/pull/56) (trying
to instantiate template with no generic param)
fixes#10753, fixes#22021, refs #19365 (was fixed by #22029, but more
faithful test added)
For whatever reason `compileTime` proc calls did not fold if the proc
was generic ([since this folding was
introduced](c25ffbf262 (diff-539da3a63df08fa987f1b0c67d26cdc690753843d110b6bf0805a685eeaffd40))).
I'm guessing the intention was for *unresolved* generic procs to not
fold, which is now the logic.
Non-magic `compileTime` procs also now don't fold at compile time in
`typeof` contexts to avoid possible runtime errors (only the important)
and prevent double/needless evaluation.
refs #22605
Sym choice nodes are now only allowed to pass through semchecking if
contexts ask for them to (with `efAllowSymChoice`). Otherwise they are
resolved or treated as ambiguous. The contexts that can receive
symchoices in this PR are:
* Call operands and addresses and emulations of such, which will subject
them to overload resolution which will resolve them or fail.
* Type conversion operands only for routine symchoices for type
disambiguation syntax (like `(proc (x: int): int)(foo)`), which will
resolve them or fail.
* Proc parameter default values both at the declaration and during
generic instantiation, which undergo type narrowing and so will resolve
them or fail.
This means unless these contexts mess up sym choice nodes should never
leave the semchecking stage. This serves as a blueprint for future
improvements to intermediate symbol resolution.
Some tangential changes are also in this PR:
1. The `AmbiguousEnum` hint is removed, it was always disabled by
default and since #22606 it only started getting emitted after the
symchoice was soundly resolved.
2. Proc setter syntax (`a.b = c` becoming `` `b=`(a, c) ``) used to
fully type check the RHS before passing the transformed call node to
proc overloading. Now it just passes the original node directly so proc
overloading can deal with its typechecking.
Move `symFromType` and `symNodeFromType` from `sem`, and `isSelf` and
`makeTypeDesc` from `concepts` into `semdata`.
`makeTypeDesc` was moved out from semdata [when the `concepts` module
was
added](6278b5d89a),
so its old position might have been intended. If not, `isSelf` can also
go in `ast`.
* Infer generic bindings
* Simple test
* Add t
* Allow it to work for templates too
* Fix some builds by putting bindings in a template
* Fix builtins
* Slightly more exotic seq test
* Test value-based generics using array
* Pass expectedType into buildBindings
* Put buildBindings into a proc
* Manual entry
* Remove leftover `
* Improve language used in the manual
* Experimental flag and fix basic constructors
* Tiny commend cleanup
* Move to experimental manual
* Use 'kind' so tuples continue to fail like before
* Explicitly disallow tuples
* Table test and document tuples
* Test type reduction
* Disable inferGenericTypes check for CI tests
* Remove tuple info in manual
* Always reduce types. Testing CI
* Fixes
* Ignore tyGenericInst
* Prevent binding already bound generic params
* tyUncheckedArray
* Few more types
* Update manual and check for flag again
* Update tests/generics/treturn_inference.nim
* var candidate, remove flag check again for CI
* Enable check once more
---------
Co-authored-by: SirOlaf <>
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
* Allows for arbitrary ordering of inheritance in type section #6259
* prevents ilegal recursion
* fixes ilegal recursion. Test passes with a better message
* Apply suggestions from code review
---------
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
* refactoring in preparation for better, simpler name mangling that works with IC flawlessly
* use new disamb field
* see if this makes tests green
* make tests green again
* better procvar ambiguity errors, clean up after #20457fixes#6359, fixes#13849
* only trigger on closedsymchoice again
* new approach
* add manual entry for ambiguous enums too
* add indent [skip ci]
* move to proc
* unnamed break in the block now gives an error
* bootstrap
* fixes
* more fixes
* break with label
* label again
* one moee
* Delete test5.txt
* it now gives a UnnamedBreak warning
* change the URL of bump back to the original one
* fix semcase on tySequence and tyObject #20283#19682
* use better arg name
* avoiding returns nil use errorNode instead, clean code
* use efNoDiagnostics flag
* remove tests/errmsgs/t19682.nim
* combine 2 test cases to one file
* micro implementation of rfc 149
refs https://github.com/nim-lang/RFCs/issues/149
* number/array/seq literals, more statements
* try fix number literal alias issue
* renew expectedType with if/case/try branch types
* fix (nerf) index type handling and float typed int
* use typeAllowed
* tweaks + const test (tested locally) [skip ci]
* fill out more of the checklist
* more literals, change @ order, type conversions
Not copying the full call tree before the typedesc call check
in `semIndirectOp` is also a small performance improvement.
* disable self-conversion warning
* revert type conversions (maybe separate op later)
* deal with CI for now (seems unrelated), try enums
* workaround CI different way
* proper fix
* again
* see sizes
* lol
* overload selection, simplify int literal -> float
* range, new @ solution, try use fitNode for nil
* use new magic
* try fix ranges, new magic, deal with #20193
* add documentation, support templates
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
* fixes#17369
* megatest is green for --cpu:arm64
* docgen output includes more tags/raises
* implemented 'effectsOf'
* algorithm.nim: uses new effectsOf annotation
* closes#18376
* closes#17475
* closes#13905
* allow effectsOf: [a, b]
* added a test case
* parameters that are not ours cannot be declared as .effectsOf
* documentation
* manual: added the 'sort' example
* bootstrap with the new better options
* Extended side effect error messages
* Applied feedback:
- refactored `markSideEffect`
- refactored string interpolations
- single message
- skip diagnostics in `system.compiles` context
Other:
- started a test of diagnostic messages
[ci skip] Tests aren't updated yet because messaging isn't nailed down.
* - Added hints of where for side effect call locations.
- Tried to clarify the reasons.
* fix tests
* Applied PR review feedback:
- moved collection of side effects from TSym to TContext
- used pragma shorthand form `.sideEffect` and `.noSideEffect` in messages
- added leading '>' to structured messages for readability
- changed `sempass2.markSideEffect` to a proc
- replaced `system.echo` in the test to make the test compatible with Windows
* Applied NEP1 formatting suggestion
Co-authored-by: quantimnot <quantimnot@users.noreply.github.com>
* CIs: attempt to use csources_v1
* also updated the BSDs
* also updated azure pipelines
* std modules should not itself use the 'std/' import dir...
* compiler has to be careful with std/ for v1 booting
* IC: first steps towards 'nim check --def --ic:on'
* IC navigator: deduplicate output lines
* IC navigator: progress
* IC navigator: use a different nimcache entry
* IC navigator: special logic for templates/macros
* IC navigator: proper error messages
* IC navigator: prepare for testing code; document only what currently works somewhat
* fix failing test toSeq in manual which now works
* changelog
* reject proc fn(a: iterable)
* add iterable to spec
* remove MCS/UFCS limitation that now works
