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`c_isnan` is not available for objectiveC backend

1

### Description Any code that imports `std/math` library fails to compile to objectiveC with "Error: undeclared identifier: 'c_isnan'" Example: ```Nim # main.nim import std/math ``` ``` $ nim objc main.nim...

janAkali

unsafeNew(UncheckedArrayXxx) does not calculate the size of sizeof(dummy).

7

### Description I allocated 10 bytes of memory, one byte occupied by the `dummy` field. ```nim type ChunkObj = object data: UncheckedArray[byte] proc alloc(size: int): ref ChunkObj = unsafeNew(result, size)...

haoyu234

Cast seq to string, heap buffer overflow with stdlib assuming terminating '\0'

5

### Description ```nim import std/sequtils proc foo(x: string) = echo x & "abc" foo(cast[string](repeat('a', 6))) ``` The error log points to this code: ```c T3_ = rawNewString(x_p0.len + 3);appendString((&T3_), x_p0);appendString((&T3_)...

planetis-m

in generics, params and return can't call procs in for their type declaration; gives Error: type mismatch

3

### Example 1 `lent type(expr)` gives Error: type mismatch ```nim proc byLent2[T](a: T): lent type(a[0]) = a[0] # Error: type mismatch: got # proc byLent2[T](a: T): lent typeof(a[0]) = a[0]...

timotheecour

Given proc and type from two different modules named the same thing, Nim prefers the type

2

**a.nim** ```nim type foo* = object x: int y: int ``` **b.nim** ```nim type testing* = object z: int proc foo*(t: testing) = echo "doink!" ``` **c.nim** ```nim import a,...

leximayfield

Macro with name `on` unexpected behaviour

4

Module A: ``` macro ona*(body: untyped): untyped = discard macro on*(body: untyped): untyped = discard ``` Module B: ``` import modulea ona: echo "a" # no problem on: echo "b"...

coffeepots

Nim tries to resolve generic field type name even though when condition is false

4

Sample: ``` nim const hasThreadSupport = compileOption("threads") type SomeObj*[T] = object when hasThreadSupport: channel: ptr Channel[T] # Error: undeclared identifier: 'Channel' ``` The error occurs when you try to compile...

endragor

Inconsisten Symbol Binding Rules in Templates/Generics

3

The issue that I want to talk about is the following for both templates and generic function implementations: When a function symbol can't be resolved in the template definition, it...

krux02

Error: overloaded 'X' leads to ambiguous calls

3

Discussing the snippet below on #nim it was suggested this was worth filing an issue. My expectation was that it would be fine to do this: ``` import strutils proc...

zevv

The compiler cannot match procedure types like `proc (_: T): R`. See https://nim-lang.org/docs/manual.html#overload-resolution for the definition of "generic match" ### Example ```nim type Callback*[S,R] = proc(_:S): R State = object...

iacore