[Issue 12813] New: Parser is confused between float and UFC syntax

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12813

          Issue ID: 12813
           Summary: Parser is confused between float and UFC syntax
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

According to the docs (lex)

"""
Floating literals can have embedded ‘_’ characters, which are ignored. The
embedded ‘_’ are useful for formatting long literals to make them more
readable, such as using them as a thousands separator
"""

And the following examples are given as valid.

123_456.567_8         // 123456.5678
1_2_3_4_5_6_._5_6_7_8 // 123456.5678
1_2_3_4_5_6_._5e-6_   // 123456.5e-6


However:

123_456.567_8         // OK
1_2_3_4_5_6_._5_6_7_8 // ERROR no property '_5_6_7_8' for type 'int'
1_2_3_4_5_6_._5e-6_   // ERROR no property '_5e' for type 'int'


Marking as regression because this would have been fine before UFCs.

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