| Commit message (Collapse) | Author | Age | Files | Lines |
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refs #24010, refs
https://github.com/nim-lang/Nim/issues/24125#issuecomment-2358377076
The generic mismatch errors added in #24010 made it possible for `nArg`
to be `nil` in the error reporting since it checked the call argument
list, not the generic parameter list for the mismatching argument node,
which causes a segfault. This is fixed by checking the generic parameter
list immediately on any generic mismatch error.
Also the `typedesc` type is skipped for the value of the generic params
since it's redundant and the generic parameter constraints don't have
it.
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fixes #22661
Range expressions in `of` branches in `case` statements start off as
calls to `..` then become `nkRange` when getting typed. For this reason
the compiler leaves `nkRange` alone when type checking the case
statements again, but it still does the exhaustiveness checking for the
entire case statement, and leaving the range alone means it doesn't
count the values of the range for exhaustiveness. So the counting is now
also done on `nkRange` nodes in the same way as when typechecking it the
first time.
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fixes #23565
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(#24111)
alternative to #24101
#23892 changed the opensym experimental switch so that it has to be
enabled in the context of the generic/template declarations capturing
the symbols, not the context of the instantiation of the
generics/templates. This was to be in line with where the compiler gives
the warnings and changes behavior in a potentially breaking way.
However `results` [depends on the old
behavior](https://github.com/arnetheduck/nim-results/blob/71d404b314479a6205bfd050f4fe5fe49cdafc69/results.nim#L1428),
so that the callers of the macros provided by results always take
advantage of the opensym behavior. To accomodate this, we change the
behavior of the old experimental option that `results` uses,
`genericsOpenSym`, so that ignores the information of whether or not
symbols are intentionally opened and always gives the opensym behavior
as long as it's enabled at instantiation time. This should keep
`results` working as is. However this differs from the normal opensym
switch in that it doesn't generate `nnkOpenSym`.
Before it was just a generics-only version of `openSym` along with
`templateOpenSym` which was only for templates. So `templateOpenSym` is
removed along with this change, but no one appears to have used it.
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split again from #24038, fixes
https://github.com/status-im/nimbus-eth2/pull/6554#issuecomment-2354977102
`var`/pointer types are no longer implicitly convertible to each other
if their element types either:
* require an int conversion or another conversion operation as long as
it's not to `openarray`,
* are subtypes with pointer indirection,
Previously any conversion below a subrange match would match if the
element type wasn't a pointer type, then it would error later in
`analyseIfAddressTaken`.
Different from #24038 in that the preview define that made subrange
matches also fail to match is removed for a simpler diff so that it can
be backported.
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fixes #24112
Sym nodes in templates that could be open are [given `nil`
type](https://github.com/nim-lang/Nim/blob/22d2cf217597468ace8ba540d6990b1f6d8a816a/compiler/semtempl.nim#L274)
when `--experimentalOpenSym` is disabled so that they can be semchecked
to give a warning since #24007. The first nodes of object constructors
(in this case) and in type conversions don't replace their first node
(the symbol) with a typechecked one, they only call `semTypeNode` on it
and leave it as is.
Effect tracking checks if the type of a sym node has a destructor to
check if the node type should be replaced with the sym type. But this
causes a segfault when the type of the node is nil. To fix this, we
always set the node type to the sym type if the node type is nil.
Alternatively `semObjConstr` and `semConv` could be changed to set the
type of their first node to the found type but I'm not sure if this
would break anything. They could call `semExprWithType` on the first
node but `semTypeNode` would still have to be called (maybe call it
before?). This isn't a problem if the sym node has a type but is just
nested in `nkOpenSym` or `nkOpenSymChoice` which have nil type instead
(i.e. with openSym enabled), so maybe this still is the "most general"
solution, I don't know.
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was introduced for debugger
https://github.com/nim-lang/Nim/commit/b63f322a466351bc57f8a4593009f0520c348527#diff-abd3a10386cf1ae32bfd3ffae82335a1938cc6c6d92be0ee492fcb44b9f2b552
https://github.com/nim-lang/Nim/blob/b63f322a466351bc57f8a4593009f0520c348527/lib/system/debugger.nim
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fixes #24097
For `nkConv` addresses where the conversion is between 2 types that are
equal between backends, treat assignments the same as assignments to the
argument of the conversion. In the VM this seems to be in `genAsgn` and
`genAsgnPatch`, as evidenced by the special logic for `nkDerefExpr` etc.
This doesn't handle ranges after #24037 because `sameBackendType` is
used and not `sameBackendTypeIgnoreRange`. This is so this is
backportable without #24037 and another PR can be opened that implements
it for ranges and adds tests as well. We can also merge
`sameBackendTypeIgnoreRange` with `sameBackendType` since it doesn't
seem like anything that uses it would be affected (only cycle checks and
the VM), but then we still have to add tests.
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fixes #24121
Proc arguments can have typeclass type like `Foo | Bar` that `sigmatch`
handles specially before matching them to the param type, because they
wouldn't match otherwise. Not exactly sure why this existed but matching
any typeclass or unresolved type in generic contexts now fails the match
so typing the call is delayed until instantiation.
Also it turns out default values with `tyFromExpr` type depending on
other parameters was never tested, this also needs a patch to make the
`tyFromExpr` type `tfNonConstExpr` so it doesn't try to evaluate the
other parameter at compile time.
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enabled (#24108)
refs #24094, soft reverts #23787
#23787 turned out to cause issues as described in #24094, but the
changes are still positive, so it is now only enabled if compiling with
`-d:nimOptIters`. Unfortunately the changes are really interwoven with
each other so the checks for this switch in the code are a bit messy,
but searching for `nimOptIters` should give the necessary clues to
remove the switch properly later on.
Locally tested that nimlangserver works but others can also check.
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fixes #24104, refs #23955
The line `result.typ = dstTyp` added in #23955 changes the type of
`result`, which was the type of `n` due to the argument passed to
`newIntNodeT`, to the abstract type skipped `dstTyp`. The line is
removed to just keep the type as abstract.
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fixes #24099
If an arbitrary expression without a proc type (in this case
`tyFromExpr`) is called, the compiler [passes it to overload
resolution](https://github.com/nim-lang/Nim/blob/793cee4de1934fd1f6271cf5fed46f01c5abb19b/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.
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follows up #24095
In #24095 a check was added that used `iterOverType` to check if a type
contained unresolved types, with the aim of always treating
`tyGenericBody` as resolved. But the body of the `tyGenericBody` is also
iterated over in `iterOverType`, so if the body of the type actually
used generic parameters (which isn't the case in the test added in
#24095, but is now), the check would still count the type as unresolved.
This is handled by not iterating over the children of `tyGenericBody`,
the only users of `iterOverType` are `containsGenericType` and
`containsUnresolvedType`, the first one always returns true for
`tyGenericBody` and the second one aims to always return false.
Unfortunately this means `iterOverType` isn't as generic of an API
anymore but maybe it shouldn't be used anymore for these procs.
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fixes regression remaining after #24092
In #24092 `prepareNode` was updated so it wouldn't try to instantiate
generic type symbols (like `Generic` when `type Generic[T] = object`,
and `prepareNode` is what `tyFromExpr` uses in most of the compiler. An
exception is in sigmatch, which is now changed to use `prepareNode` to
make generic type symbols work in the same way as usual. However this
requires another change to work:
Dot fields and matches to `typedesc` on generic types generate
`tyFromExpr` in generic contexts since #24005, including generic type
symbols. But this means when we try to instantiate the `tyFromExpr` in
sigmatch, which increases `c.inGenericContext` for potentially remaining
unresolved expressions, dotcalls stay as `tyFromExpr` and so never
match. To fix this, we change the "generic type" check in dot fields and
`typedesc` matching to an "unresolved type" check which excludes generic
body types; and for generic body types, we only generate `tyFromExpr` if
the dot field is a generic parameter of the generic type (so that it
gets resolved only at instantiation).
Notes for the future:
* Sigmatch shouldn't have to `inc c.inGenericContext`, if a `tyFromExpr`
can't instantiate it's fine if we just fail the match (i.e. redirect the
instantiation errors from `semtypinst` to a match failure). Then again
maybe this is the best way to check for inability to instantiate.
* The `elif c.inGenericContext > 0 and t.containsUnresolvedType` check
in dotfields could maybe be simplified to just checking for `tyFromExpr`
and `tyGenericParam`, but I don't know if this is an exhaustive list.
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fixes #23506
#24065 broke compilation of template parameter default values that
depended on other template parameters. But this was never implemented
anyway, actually attempting to use those default values breaks the
compiler as in #23506. So these are now implemented as well as fixing
the regression.
First, if a default value expression uses any unresolved arguments
(generic or normal template parameters) in a template header, we leave
it untyped, instead of applying the generic typechecking (fixing the
regression). Then, just before the body of the template is about to be
explored, the default value expressions are handled in the same manner
as the body as well. This captures symbols including the parameters, so
the expression is checked again if it contains a parameter symbol, and
marked with `nfDefaultRefsParam` if it does (as an optimization to not
check it later).
Then when the template is being evaluated, when substituting a
parameter, if we try to substitute with a node marked
`nfDefaultRefsParam`, we also evaluate it as we would the template body
instead of passing it as just a copy (the reason why it never worked
before). This way we save time if a default value doesn't refer to
another parameter and could just be copied regardless.
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fixes #24090
Generic body types are normally a sign of an uninstantiated type, and so
give errors when trying to instantiate them. However when instantiating
free user expressions like the nodes of `tyFromExpr`, generic default
params, static values etc, they can be used as arguments to macros or
templates etc (as in the issue). So, we don't try to instantiate generic
body type symbols at all in free expressions such as these (but not in
for example type nodes), and avoid the error.
In the future there should be a "concrete type" check for generic body
types different from the check in type instantiation to deal with things
like #24091, if we do want to allow this use of them.
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(#23305)
… and compiler messages
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fixes #5395
Previously values of `const` statements used the same scope as the
`const` statement itself, meaning variables could be declared inside
them and referred to in other statements in the same block. Now each
`const` value opens its own scope, so any variable declared in the value
of a constant can only be accessed for that constant.
We could change this to open a new scope for the `const` *section*
rather than each constant, so the variables can be used in other
constants, but I'm not sure if this is sound.
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fixes #21353
```nim
result = newNodeIT(nkTupleConstr, info, t)
result.add(newNodeIT(nkNilLit, info, t))
result.add(newNodeIT(nkNilLit, info, t))
```
The old implementation uses `t` which is the type of the closure
function as its type. It is not correct and generates ((nil, nil), (nil,
nil)) for `default(closures)`. This PR creates `(tyPointer, tyPointer)`
for fake closure types just like what cctypes do.
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Caught in https://github.com/metagn/applicates, I'm not sure which
commit causes this but it's also in the 2.0 branch (but not 2.0.2), so
it's not any recent PRs.
If a proc has a static parameter with type `static Foo[T]`, then another
parameter with type `static Bar[T, U]`, the generic instantiation for
`Bar` doesn't match `U` which has type `tyGenericParam`, but matches `T`
since it has type `tyTypeDesc`. The reason is that `concreteType`
returns the type itself for `tyTypeDesc` if `c.isNoCall` (i.e. matching
a generic invocation), but returns `nil` for `tyGenericParam`. I'm
guessing `tyGenericParam` is received here because of #22618, but that
doesn't explain why `T` is still `tyTypeDesc`. I'm not sure.
Regardless, we can just copy the behavior for `tyTypeDesc` to
`tyGenericParam` and also return the type itself when `c.isNoCall`. This
feels like it defeats the purpose of `concreteType` but the way it's
used doesn't make sense without it (generic param can't match another
generic param?). Alternatively we could loosen the `if concrete == nil:
return isNone` checks in some places for specific conditions, whether
`c.isNoCall` or `c.inGenericContext == 0` (though this would need
#24005).
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fixes #23397
All ambiguous symbols generate symchoices for call arguments since
#23123. So, if a type mismatch receives a symchoice node for an
argument, we now treat it as an ambiguous identifier and list the
ambiguous symbols in the error message.
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fixes CI, refs #24066, refs #24065
The combination of #24065 and #24066 caused a CI failure where a `when`
branch that was never compiled gave an undeclared identifier error. This
is because the `when` branch was being semchecked with `semGenericStmt`
without `withinMixin`, which is the flag `semgnrc` normally gives to
`when` branch bodies. To fix this, just pass the whole `when` stmt to
`semGenericStmt` rather than the individual blocks.
The alternative would be to just replace the calls to `semGenericStmt`
with a new proc that does the same thing, just with the flags
`{withinMixin}`.
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fixes #15959
Another followup of #22029 and #24005, subscript expressions now
recognize when their parameters are generic types, then generating
tyFromExpr. `typeof` also now properly sets `tfNonConstExpr` to make it
usable in proc signatures. `lent` with brackets like `lent[T]` is also
now allowed.
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I noticed after #24005 the auto-reported boot time in PRs increased from
around 8 seconds to 8.8 seconds, but I wasn't sure what could cause a
performance problem that made the compiler itself compile slower, most
of the changes were related to `static` which the compiler code doesn't
use too often. So I figured it was unrelated.
However there is still a performance problem with the changes to
`tryReadingGenericParam`. If an expression like `a.b` doesn't match any
of the default dot field behavior (for example, is actually a call
`b(a)`), the compiler does a final check to see if `b` is a generic
parameter of `a`. Since #24005, if the type of `a` is not
`tyGenericInst` or an old concept type, the compiler does a full
traversal of the type of `a` to see if it contains a generic type, only
then checking for `c.inGenericContext > 0` to not return `nil`. This
happens on *every* dot call.
Instead, we now check for `c.inGenericContext > 0` first, only then
checking if it contains a generic type, saving performance by virtue of
`c.inGenericContext > 0` being both cheap and less commonly true. The
`containsGenericType` could also be swapped out for more generic type
kind checks, but I think this is incorrect even if it might pass CI.
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fixes #22342, fixes #22607
Another followup of #22029, `when` expressions in general in generic
type bodies now behave like `nkRecWhen` does since #24042, leaving them
as `tyFromExpr` if a condition is uncertain. The tests for the issues
were originally added but left disabled in #24005.
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fixes #16700, fixes #20916, refs #24010
Fixes the instantiation issues for proc param default values encountered
in #24010 by:
1. semchecking generic default param values with `inGenericContext` for
#22029 and followups to apply (the bigger change in semtypes),
2. rejecting explicit generic instantiations with unresolved generic
types inside `inGenericContext` (sigmatch change),
3. instantiating the default param values using `prepareNode` rather
than an insufficient manual method (the bigger change in seminst).
This had an important side effect of references to other parameters not
working since they would be resolved as a symbol belonging to the
uninstantiated original generic proc rather than the later instantiated
proc. There is a more radical way to fix this which is generating ident
nodes with `tyFromExpr` in specifically this context, but instead we
just count them as belonging to the same proc in
`hoistParamsUsedInDefault`.
Other minor bugfixes:
* To make the error message in t20883 make sense, we now give a "cannot
instantiate" error when trying to instantiate a proc generic param with
`tyFromExpr`.
* Object constructors as default param values generated default values
of private fields going through `evalConstExpr` more than once, but the
VM doesn't mark the object fields as `nfSkipFieldChecking` which gives a
"cannot access field" error. So the VM now marks object fields it
generates as `nfSkipFieldChecking`. Not sure if this affects VM
performance, don't see why it would.
* The nkRecWhen changes in #24042 didn't cover the case where all
conditions are constantly false correctly, this is fixed with a minor
change. This isn't needed for this PR now but I encountered it after
forgetting to `dec c.inGenericContext`.
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restrictions; no crossing push/pop barriers (#24061)
fixes #24053;
fixes #18288
makes push pragmas depend on each node before it and nodes after it
depend on it
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The magic `mArrGet`/`mArrPut` subscript overloads always match, so if a
subscript doesn't match any other subscript overloads and isn't a
regular language-handled subscript, it creates a fake overload mismatch
error in `semArrGet` that doesn't have any information (gives stuff like
"first mismatch at index: 0" for every single mismatch). Instead of
generating the fake mismatches, we only generate the fake mismatch for
`mArrGet`/`mArrPut`, and process every overload except them as a real
call and get the errors from there.
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refs #21682, refs #24038
The `rangeBase` typetrait added in #21682 which gives the base type of a
range type is now added publicly to `typetraits`. Previously it was only
privately used in `repr_v2` and in `enumutils` since #24052
(coincidentally I didn't see this until now). This is part of an effort
to make range types easier to work with in generics, as mentioned in
#24038. Its use combined with #24037 is also tested.
The condition for the "enum to enum conversion" warning is now also
restricted to conversions between different enum base types, i.e.
conversion between an enum type and a range type of itself doesn't give
a warning. I put this in this PR since the test gave the warning and so
works as a regression test.
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fixes #13979
Fixes templates in generics that use identifiers that aren't defined
yet, giving an early `undeclared identifier` error, by just marking
template bodies as in a mixin context in `semgnrc`.
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fixes #23897
follow up https://github.com/nim-lang/Nim/pull/21288
follow up https://github.com/nim-lang/Nim/pull/22472
Since #22472 triggers `nimTestErrorFlag` in every module that isn't
empty, this PR removes unnecessary logic
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fixes #24057
Instead of crashing the compiler, the VM now gives a stacktrace if a nil
closure is attempted to be called.
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ref https://forum.nim-lang.org/t/11590
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refs #24032, split from #24036
Conversion from variables of range types or base types of range types to
the other are now considered mutable for `var` params, similar to how
distinct types are mutable when converted to their base type or vice
versa. There are 2 main differences:
1. Conversions from base types to range types need to emit
`nkChckRange`, which is not generated for things like tuple/object
fields.
2. Range types can still correspond to different types in the backend
when nested in other types, such as `set[range[3..5]]` vs
`set[range[0..5]]`.
Since the convertibility check for `var` params and a check whether to
emit a no-op for `nkConv` (and now also `nkChckRange`) so that the
output is still addressable both use `sameType`, we accomplish this by
adding a new flag to `sameType` that ignores range types, but only when
they're not nested in other types. The implementation for this might be
flawed, I didn't include children of some metatypes as "nested in other
types", but stuff like `tyGenericInst` params are respected.
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fixes #24044
When matching a `tyFromExpr` against a `static` generic parameter,
`paramTypesMatch` tries to evaluate it as a constant expression, which
causes a segfault in the case of #24044. In #24005 a consequence of the
same behavior was an issue where `nkStaticExpr` was created for
`tyFromExpr` which made it not instantiate, so only the generation of
`nkStaticExpr` was disabled. Instead we now just completely ignore
`tyFromExpr` matching a `static` generic parameter in generic contexts
and keep it untouched.
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fixes #24048
Generic lambdas get instantiated via `replaceTypesInBody` which calls
`replaceTypeVarsN` on the body of the lambda. This body can contain sym
nodes of gensym symbols generated by macros, which have `nil` type. But
a piece of code in `replaceTypeVarsN` checks whether the type of a
symbol is equal to `void` without checking if it's `nil` first, which
causes a segfault. Now it also checks that the type of the symbol isn't
`nil` for it to be `void`.
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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](https://github.com/nim-lang/Nim/blob/b7b1313d21deb687adab2b4a162e716ba561a26b/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)
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fixes #24033
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fixes #24041
`when` statements in generic object types normally just leave their
conditions as expressions and still typecheck their branch bodies.
Instead of this, when the condition can be evaluated as a constant as
well as the ones before it and it resolves to `true`, it now uses the
body of that branch without typechecking the remaining ones.
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fixes #24031
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fixes #24034
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fixes #17848
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fixes #12539, refs #21636
`evalInclude` now uses `getPIdent` to check if a symbol isn't `/`
anymore instead of assuming it's an ident, which it's not when used in
templates. Also it just checks if the symbol is `as` now, because there
are other infix operators that could be used like `/../`.
It also works with prefix operators now by copying what was done in
#21636.
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names causing invalid codegen (#23924)
… type names causing invalid codegen
fixes #23923
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