Pragma nodes in templates are completely unprocessed

[metagn]

Description

From Discord:

macro mymacro(typ: typedesc; def) =
  def

macro mymacro2(typ: typedesc; typ2: typedesc; def) =
  def

template mytemplate(typ: typedesc) =   # works
  proc myproc() {.mymacro: typ .} =
    discard

template mytemplate2(typ: typedesc) =   # Error: undeclared identifier: 'typ'
  proc myproc2() {.mymacro(typ) .} =
    discard
  
template mytemplate2(typ: typedesc, typ2: typedesc) =  # Error: undeclared identifier: 'typ'
  proc myproc3() {.mymacro2(typ, typ2) .} =
    discard
  
template mytemplate4() =  # works
  proc myproc4() {.mymacro2(string, int) .} =
    discard

mytemplate(string)
mytemplate2(string)      # fails to compile if uncommented
mytemplate3(string, int) # fails to compile if uncommented
mytemplate4()

Nim Version

all versions

Current Output

Error: undeclared identifier: 'typ'

Expected Output

compiles

Known Workarounds

calling the macro explicitly

Additional Information

Culprit is here, only colon expressions are checked:

Nim/compiler/semtempl.nim

Lines 541 to 544 in a275421

	of nkPragma:
	for x in n:
	if x.kind == nkExprColonExpr:
	x[1] = semTemplBody(c, x[1])