Fixes for emit_diagnostics api changes

Author: c42f

src/literal_parsing.jl

@@ -243,7 +243,7 @@ function unescape_julia_string(io::IO, str::AbstractString,
         escstart = i
         i += 1
         if i >= endind
-            emit_diagnostic(diagnostics, escstart:endind-1,
+            emit_diagnostic(diagnostics, escstart, endind-1,
                             error="invalid escape sequence")
             had_error = true
             break

test/diagnostics.jl

@@ -40,8 +40,8 @@ end
     @test diagnostic("x = '\\k'") ==
         Diagnostic(6, 7, :error, "invalid escape sequence")
     @test diagnostic("'\\", allow_multiple=true) == [
-        Diagnostic(2, 2, :error, "invalid escape sequence"),
-        Diagnostic(3, 2, :error, "unterminated character literal")
+        Diagnostic(3, 2, :error, "unterminated character literal"),
+        Diagnostic(2, 2, :error, "invalid escape sequence")
     ]
 
     # String