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tpl: Modify error messages of after, first, and last

Modified the messages functions after, first, and last threw on being passed invalid parameters (index or limit) to be more standardised and resemble what Go compiler would throw.

Fixes #6415

--- a/tpl/collections/collections.go

+++ b/tpl/collections/collections.go

@@ -61,7 +61,7 @@

 	}

 	if indexv < 0 {

-		return nil, errors.New("can't return negative/empty count of items from sequence")

+		return nil, errors.New("sequence bounds out of range [" + cast.ToString(indexv) + ":]")

 	}

 	seqv := reflect.ValueOf(seq)

@@ -219,7 +219,7 @@

 	}

 	if limitv < 0 {

-		return nil, errors.New("can't return negative count of items from sequence")

+		return nil, errors.New("sequence length must be non-negative")

 	}

 	seqv := reflect.ValueOf(seq)

@@ -379,7 +379,7 @@

 	}

 	if limitv < 0 {

-		return nil, errors.New("can't return negative/empty count of items from sequence")

+		return nil, errors.New("sequence length must be non-negative")

 	}

 	seqv := reflect.ValueOf(seq)