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top-down type inference, implements rfc 149 (#20091)

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* 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>
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metagn 2022-08-24 08:11:41 +03:00 • committed by GitHub
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24
lib/system.nim
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@ -1614,13 +1614,23 @@ proc isNil*[T: proc](x: T): bool {.noSideEffect, magic: "IsNil".}
## `== nil`.
proc `@`*[T](a: openArray[T]): seq[T] =
## Turns an *openArray* into a sequence.
##
## This is not as efficient as turning a fixed length array into a sequence
## as it always copies every element of `a`.
newSeq(result, a.len)
for i in 0..a.len-1: result[i] = a[i]
when defined(nimHasTopDownInference):
# magic used for seq type inference
proc `@`*[T](a: openArray[T]): seq[T] {.magic: "OpenArrayToSeq".} =
## Turns an *openArray* into a sequence.
##
## This is not as efficient as turning a fixed length array into a sequence
## as it always copies every element of `a`.
newSeq(result, a.len)
for i in 0..a.len-1: result[i] = a[i]
else:
proc `@`*[T](a: openArray[T]): seq[T] =
## Turns an *openArray* into a sequence.
##
## This is not as efficient as turning a fixed length array into a sequence
## as it always copies every element of `a`.
newSeq(result, a.len)
for i in 0..a.len-1: result[i] = a[i]
when defined(nimSeqsV2):