Source position in error message is not highlighted in some cases

[simonvonhackewitz]

With ANSI escapes enabled position at line end is not highlighted

For all errors which only have a position but no range, the position is only highlighted if ANSI escapes are disabled, if I am not mistaken.

Note this example needs change from #3457.

The fuzion file contains no final newline.

> cat /tmp/bug.fz 
(#%

> FUZION_DISABLE_ANSI_ESCAPES=true fz /tmp/bug.fz

/tmp/bug.fz:1:3: error 1: Syntax error: expected term (lbrace, lparen, lcrochet, fun, string, integer, old, match, or name), found end-of-file
(#
--^
While parsing: term, parse stack: term, opTail, opExpr, operatorExpr, klammer, bracketTerm, term, opTail, opExpr, operatorExpr, expr, exprs, block, unit

one error.

> FUZION_DISABLE_ANSI_ESCAPES=false fz /tmp/bug.fz 

/tmp/bug.fz:1:3: error 1: Syntax error: expected term (lbrace, lparen, lcrochet, fun, string, integer, old, match, or name), found end-of-file
(#

While parsing: term, parse stack: term, opTail, opExpr, operatorExpr, klammer, bracketTerm, term, opTail, opExpr, operatorExpr, expr, exprs, block, unit

one error.

No Position highlighted in error for missing then block

This happens for both enabled and disabled ANSI escapes.

> cat /tmp/test.fz
f(x i32) i32 =>
  if x<0 then
  else x

> FUZION_DISABLE_ANSI_ESCAPES=true fz /tmp/test.fz

/tmp/test.fz:2:14: error 1: Block must end with a result expression
  if x<0 then
-------------
This block must produce a value since its result is used by the enclosing expression.
Expected type of value: 'i32'

one error.